yv12extend: name variables consistently

- s|source -> src
- dest -> dst
- use verbose names in extend_plane dropping the redundant comments

+ light cosmetics:
- join a few lines / assignments
- drop some unnecessary comments & includes

Change-Id: I6d979a85a0223a0a79a22f79a6d9c7512fd04532
Merge "vp9: remove unnecessary wait w/threaded loopfilter"
cosmetics: strip 'VP9_' from defines in vp9 only code

Change-Id: I481d9bb2fa3ec72b6a83d5f04d545ad8013f295c
Merge "yv12extend: name variables consistently"
Merge "cosmetics: strip 'VP9_' from defines in vp9 only code"
cosmetics: yv12extend add some const

Change-Id: I87f1ce2ceca80d3869dd72ba862329a98eb3e0c2
Merge "cosmetics: yv12extend add some const"
Temporarily disable SSSE3 quant_32x32

Make the current head working properly, while working on fixing an
issue in the SSSE3 implementation of 32x32 quantization.

Change-Id: Ic029da3fd7f1f5e58bc641341cbd226ec49a16bc
Merge "Removing redundant calls to clamp_mv2."
Merge "Temporarily disable SSSE3 quant_32x32"
Renaming BLOCK_SIZE_TYPE to BLOCK_SIZE in the common/decoder.

Adding temporary "typedef BLOCK_SIZE BLOCK_SIZE_TYPE" which will go away
after encoder's patch.

Change-Id: I06ec6a6f079401439843ec981d1496234fd7775c
Merge "Limit Key frame Intra modes checks."
Fix the reading of too many input pixels

in VP9_get4x4var_mmx

Change-Id: I4b4a8f45f25ebdfad281f169cc87aba5e2d6f227
Merge "Changes to adaptive inter rd thresholds."
Merge "Fix the reading of too many input pixels"
Using num_8x8_* lookup tables instead of mi_*_log2.

Change-Id: I8a246b3d056c98be614d05a90bc261e2441ffc10
Fix Chroma plane md5 check

Chroma plane MD5 calculation was incorrect for 444 and 422
yuv color spaces.

Change-Id: If985396871a2f57db85108a4355172f9793d3007
Cleaning up decode_block_intra function.

Change-Id: Ia41ea5d526d15fcbc9b56d74079593cf8b2fdf66
Add a test vector that tests color space 444

This adds a test vector for 444 color space.

Change-Id: I1e2ac3883211989a062cfafc0e58151b14d294b8
Merge "Fix Chroma plane md5 check"