Reviewers: ulan, Benedikt Meurer,
Description:
[ARM64] [turbofan] Support uxtb/uxth for add/sub.
Add support for appending extend modes uxtb or uxth to add and subtract
instructions, and using them in the instruction selector.
BUG=
Please review this at https://codereview.chromium.org/1021533002/
Base URL: https://chromium.googlesource.com/v8/v8.git@master
Affected files (+132, -11 lines):
M src/compiler/arm64/code-generator-arm64.cc
M src/compiler/arm64/instruction-codes-arm64.h
M src/compiler/arm64/instruction-selector-arm64.cc
M test/unittests/compiler/arm64/instruction-selector-arm64-unittest.cc
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