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This is a patch to X86TargetLowering::LowerToBT() which was hashed over on the Developers list with Intel concurring. It checks whether the -Oz (optimize for size) flag is set or whether the containing function's PGO cold attribute is set. If either are true it emits BT for tests of bits 8-31 instead of TEST. Previously, TEST was always used for bits 0-31 and BT was always used for bits