modify EncoderFrame return type.
commit b99a307ab94183c32a293ad5fda8b0e3323546a0
Author: ruil2 <ruil2@cisco.com>
Date:   Wed Mar 12 13:34:27 2014 +0800

    fix typo
modify unit test for return type modification
fix typo
Use movsxd in SIGN_EXTENSION

This is what nasm ended up assembling movsx with 32 bit input to
anyway.

Keep using plain movsx for 16 bit input.

This fixes building with yasm in 64 bit mode.
Fold ALIGN 16 and the function label into WELS_EXTERN

This simplifies the structure for all x86 assembly functions,
reducing the amount of duplicated code structure.
Don't clobber q4-q7 in WelsIntra16x16Combined3Satd_neon

This is similar to what is done in other neon functions. This
function was missed since it isn't covered by the current
set of unittests.
Enable the arm assembly in msvc-arm builds

This requires using the external gas-preprocessor tool that
converts the gnu assembler format sources to armasm format at
build time. This allows keeping the source files in one single
format but only converting while building.
Merge pull request #521 from mstorsjo/neon-register-backup

Don't clobber q4-q7 in WelsIntra16x16Combined3Satd_neon
Merge pull request #517 from mstorsjo/simplify-x86-asm-func-macro

Fold ALIGN 16 and the function label into WELS_EXTERN
Merge pull request #516 from mstorsjo/fix-yasm-64bit

Fix building with yasm in 64 bit mode
Merge pull request #523 from mstorsjo/wp8-arm-asm

Enable the arm assembly in msvc-arm builds
expand structure of MD and ME
Merge pull request #513 from ruil2/encoder_interface

Encoder interface
Merge pull request #524 from sijchen/me_refactor33

Expand structure of MD and ME