Merge changes from libvpx/master by cherry-pick

This commit bring all up-to-date changes from master that are
applicable to nextgenv2. Due to the remove VP10 code in master,
we had to cherry pick the following commits to get those changes:

Add default flags for arm64/armv8 builds

Allows building simple targets with sane default flags.

For example, using the Android arm64 toolchain from the NDK:
https://developer.android.com/ndk/guides/standalone_toolchain.html
./build/tools/make-standalone-toolchain.sh --arch=arm64 \
  --platform=android-24 --install-dir=/tmp/arm64
CROSS=/tmp/arm64/bin/aarch64-linux-android- \
  ~/libvpx/configure --target=arm64-linux-gcc --disable-multithread

BUG=webm:1143

vpx_lpf_horizontal_4_sse2: Remove dead load.

Change-Id: I51026c52baa1f0881fcd5b68e1fdf08a2dc0916e

Fail early when android target does not include --sdk-path

Change-Id: I07e7e63476a2e32e3aae123abdee8b7bbbdc6a8c

configure: clean up var style and set_all usage

Use quotes whenever possible and {} always for variables.

Replace multiple set_all calls with *able_feature().

Conflicts:
	build/make/configure.sh

vp9-svc: Remove some unneeded code/comment.

datarate_test,DatarateTestLarge: normalize bits type

quiets a msvc warning:
conversion from 'const int64_t' to 'size_t', possible loss of data

mips added p6600 cpu support

Removed -funroll-loops

psnr.c: use int64_t for sum of differences

Since the values can be negative.

*.asm: normalize label format

add a trailing ':', though it's optional with the tools we support, it's
more common to use it to mark a label. this also quiets the
orphan-labels warning with nasm/yasm.

BUG=b/29583530

Prevent negative variance

Due to rounding, hbd variance may become negative. This commit put in
check and clamp of negative values to 0.

configure: remove old visual studio support (<2010)

BUG=b/29583530

Conflicts:
	configure

configure: restore vs_version variable

inadvertently lost in the final patchset of:
078dff7 configure: remove old visual studio support (<2010)

this prevents an empty CONFIG_VS_VERSION and avoids make failure

Require x86inc.asm

Force enable x86inc.asm when building for x86. Previously there were
compatibility issues so a flag was added to simplify disabling this
code.

The known issues have been resolved and x86inc.asm is the preferred
abstraction layer (over x86_abi_support.asm).

BUG=b:29583530

convolve_test: fix byte offsets in hbd build

CONVERT_TO_BYTEPTR(x) was corrected in:
003a9d2 Port metric computation changes from nextgenv2
to use the more common (x) within the expansion. offsets should occur
after converting the pointer to the desired type.

+ factorized some common expressions

Conflicts:
	test/convolve_test.cc

vpx_dsp: remove x86inc.asm distinction

BUG=b:29583530

Conflicts:
	vpx_dsp/vpx_dsp.mk
	vpx_dsp/vpx_dsp_rtcd_defs.pl
	vpx_dsp/x86/highbd_variance_sse2.c
	vpx_dsp/x86/variance_sse2.c

test: remove x86inc.asm distinction

BUG=b:29583530

Conflicts:
	test/vp9_subtract_test.cc

configure: remove x86inc.asm distinction

BUG=b:29583530

Change-Id: I59a1192142e89a6a36b906f65a491a734e603617

Update vpx subpixel 1d filter ssse3 asm

Speed test shows the new vertical filters have degradation on Celeron
Chromebook. Added "X86_SUBPIX_VFILTER_PREFER_SLOW_CELERON" to control
the vertical filters activated code. Now just simply active the code
without degradation on Celeron. Later there should be 2 set of vertical
filters ssse3 functions, and let jump table to choose based on CPU type.

improve vpx_filter_block1d* based on replace paddsw+psrlw to pmulhrsw

Make set_reference control API work in VP9

Moved the API patch from NextGenv2. An example was included.
To try it, for example, run the following command:
$ examples/vpx_cx_set_ref vp9 352 288 in.yuv out.ivf 4 30

Conflicts:
	examples.mk
	examples/vpx_cx_set_ref.c
	test/cx_set_ref.sh
	vp9/decoder/vp9_decoder.c

deblock filter : moved from vp8 code branch

The deblocking filters used in vp8 have been moved to vpx_dsp for
use by both vp8 and vp9.

vpx_thread.[hc]: update webp source reference

+ drop the blob hash, the updated reference will be updated in the
commit message

BUG=b/29583578

vpx_thread: use native windows cond var if available

BUG=b/29583578

original webp change:

commit 110ad5835ecd66995d0e7f66dca1b90dea595f5a
Author: James Zern <jzern@google.com>
Date:   Mon Nov 23 19:49:58 2015 -0800

    thread: use native windows cond var if available

    Vista / Server 2008 and up. no speed difference observed.

100644 blob 4fc372b7bc6980a9ed3618c8cce5b67ed7b0f412 src/utils/thread.c
100644 blob 840831185502d42a3246e4b7ff870121c8064791 src/utils/thread.h

vpx_thread: use InitializeCriticalSectionEx if available

BUG=b/29583578

original webp change:

commit 63fadc9ffacc77d4617526a50c696d21d558a70b
Author: James Zern <jzern@google.com>
Date:   Mon Nov 23 20:38:46 2015 -0800

    thread: use InitializeCriticalSectionEx if available

    Windows Vista / Server 2008 and up

100644 blob f84207d89b3a6bb98bfe8f3fa55cad72dfd061ff src/utils/thread.c
100644 blob 840831185502d42a3246e4b7ff870121c8064791 src/utils/thread.h

vpx_thread: use WaitForSingleObjectEx if available

BUG=b/29583578

original webp change:

commit 0fd0e12bfe83f16ce4f1c038b251ccbc13c62ac2
Author: James Zern <jzern@google.com>
Date:   Mon Nov 23 20:40:26 2015 -0800

    thread: use WaitForSingleObjectEx if available

    Windows XP and up

100644 blob d58f74e5523dbc985fc531cf5f0833f1e9157cf0 src/utils/thread.c
100644 blob 840831185502d42a3246e4b7ff870121c8064791 src/utils/thread.h

vpx_thread: use CreateThread for windows phone

BUG=b/29583578

original webp change:

commit d2afe974f9d751de144ef09d31255aea13b442c0
Author: James Zern <jzern@google.com>
Date:   Mon Nov 23 20:41:26 2015 -0800

    thread: use CreateThread for windows phone

    _beginthreadex is unavailable for winrt/uwp

    Change-Id: Ie7412a568278ac67f0047f1764e2521193d74d4d

100644 blob 93f7622797f05f6acc1126e8296c481d276e4047 src/utils/thread.c
100644 blob 840831185502d42a3246e4b7ff870121c8064791 src/utils/thread.h

vp9_postproc.c missing extern.

BUG=webm:1256

deblock: missing const on extern const.

postproc - move filling of noise buffer to vpx_dsp.

Fix encoder crashes for odd size input

clean-up vp9_intrapred_test

remove tuple and overkill VP9IntraPredBase class.

postproc: noise style fixes.

gtest-all.cc: quiet an unused variable warning

under windows / mingw builds

vp9_intrapred_test: follow-up cleanup

address few comments from ce050afaf3e288895c3bee4160336e2d2133b6ea

Change-Id: I3eece7efa9335f4210303993ef6c1857ad5c29c8
57 files changed