Delete the od_ec_enc_checkpoint/rollback functions

Also delete the OD_COPY and OD_MOVE macros.

These are all unused.

Change-Id: I3bd9fbc1a4b592f9591eff721968df2273c9098f

aom_dsp/entenc.c

diff --git a/aom_dsp/entenc.c b/aom_dsp/entenc.c
index dfc1624..f8b5da9 100644
--- a/aom_dsp/entenc.c
+++ b/aom_dsp/entenc.c
@@ -372,28 +372,3 @@
 uint32_t od_ec_enc_tell_frac(const od_ec_enc *enc) {
   return od_ec_tell_frac(od_ec_enc_tell(enc), enc->rng);
 }
-
-/*Saves a entropy coder checkpoint to dst.
-  This allows an encoder to reverse a series of entropy coder
-   decisions if it decides that the information would have been
-   better coded some other way.*/
-void od_ec_enc_checkpoint(od_ec_enc *dst, const od_ec_enc *src) {
-  OD_COPY(dst, src, 1);
-}
-
-/*Restores an entropy coder checkpoint saved by od_ec_enc_checkpoint.
-  This can only be used to restore from checkpoints earlier in the target
-   state's history: you can not switch backwards and forwards or otherwise
-   switch to a state which isn't a casual ancestor of the current state.
-  Restore is also incompatible with patching the initial bits, as the
-   changes will remain in the restored version.*/
-void od_ec_enc_rollback(od_ec_enc *dst, const od_ec_enc *src) {
-  unsigned char *buf;
-  uint32_t storage;
-  assert(dst->storage >= src->storage);
-  buf = dst->buf;
-  storage = dst->storage;
-  OD_COPY(dst, src, 1);
-  dst->buf = buf;
-  dst->storage = storage;
-}

aom_dsp/entenc.h

diff --git a/aom_dsp/entenc.h b/aom_dsp/entenc.h
index d26f027..1a38aff 100644
--- a/aom_dsp/entenc.h
+++ b/aom_dsp/entenc.h
@@ -74,9 +74,6 @@
 OD_WARN_UNUSED_RESULT uint32_t od_ec_enc_tell_frac(const od_ec_enc *enc)
     OD_ARG_NONNULL(1);
 
-void od_ec_enc_checkpoint(od_ec_enc *dst, const od_ec_enc *src);
-void od_ec_enc_rollback(od_ec_enc *dst, const od_ec_enc *src);
-
 // buf is the frame bitbuffer, offs is where carry to be added
 static AOM_INLINE void propagate_carry_bwd(unsigned char *buf, uint32_t offs) {
   uint16_t sum, carry = 1;

aom_dsp/odintrin.h

diff --git a/aom_dsp/odintrin.h b/aom_dsp/odintrin.h
index 20a7f58..9e4ba50 100644
--- a/aom_dsp/odintrin.h
+++ b/aom_dsp/odintrin.h
@@ -70,20 +70,6 @@
 #define OD_ARG_NONNULL(x)
 #endif
 
-/** Copy n elements of memory from src to dst. The 0* term provides
-    compile-time type checking  */
-#if !defined(OVERRIDE_OD_COPY)
-#define OD_COPY(dst, src, n) \
-  (memcpy((dst), (src), sizeof(*(dst)) * (n) + 0 * ((dst) - (src))))
-#endif
-
-/** Copy n elements of memory from src to dst, allowing overlapping regions.
-    The 0* term provides compile-time type checking */
-#if !defined(OVERRIDE_OD_MOVE)
-# define OD_MOVE(dst, src, n) \
- (memmove((dst), (src), sizeof(*(dst))*(n) + 0*((dst) - (src)) ))
-#endif
-
 /*All of these macros should expect floats as arguments.*/
 # define OD_SIGNMASK(a) (-((a) < 0))
 # define OD_FLIPSIGNI(a, b) (((a) + OD_SIGNMASK(b)) ^ OD_SIGNMASK(b))