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from 9ac873f1425 Avoid Wparentheses warning. new 736b52b86d1 [X86] Make 'xchgq %rax, %rax' an alias for the 0x90 nop enc [...] new b43bf79618a [X86] Revisit the fix I made years ago to make 'xchgl %eax, [...]

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Summary of changes: lib/Target/X86/X86InstrInfo.td | 23 ++++++++++++----------- lib/Target/X86/X86RegisterInfo.td | 5 ----- test/MC/X86/x86-64.s | 4 ++-- utils/TableGen/X86RecognizableInstr.cpp | 2 -- 4 files changed, 14 insertions(+), 20 deletions(-)