Fail on bit-depth > 8 if CONFIG_AV1_HIGHBITDEPTH=0

Fail gracefully on bit depth 10 or 12 if CONFIG_AV1_HIGHBITDEPTH is set
to 0.

Tested:
  cmake ../aom -DCONFIG_AV1_HIGHBITDEPTH=0
  make -j20
  ./test_libaom --gtest_filter=*TestVectorTest*

Sample test outputs:

Before:
Segmentation fault

After:
Expected equality of these values:
  AOM_CODEC_OK
    Which is: 0
  res_dec
    Which is: 5
Bit-depth 10 not supported

BUG=aomedia:2479

Change-Id: I8693829054b8205c9eb5054f5e4e1c5c027532ed

av1/decoder/decodeframe.c

diff --git a/av1/decoder/decodeframe.c b/av1/decoder/decodeframe.c
index 7584679..b51a8e3 100644
--- a/av1/decoder/decodeframe.c
+++ b/av1/decoder/decodeframe.c
@@ -4010,6 +4010,12 @@
     aom_internal_error(error_info, AOM_CODEC_UNSUP_BITSTREAM,
                        "Unsupported profile/bit-depth combination");
   }
+#if !CONFIG_AV1_HIGHBITDEPTH
+  if (seq_params->bit_depth > AOM_BITS_8) {
+    aom_internal_error(error_info, AOM_CODEC_UNSUP_BITSTREAM,
+                       "Bit-depth %d not supported", seq_params->bit_depth);
+  }
+#endif
 }
 
 void av1_read_film_grain_params(AV1_COMMON *cm,