[PATCH] D24359: Win64: Don't use REX prefix for direct tail calls

[Hans Wennborg via llvm-commits]

hans created this revision.
hans added reviewers: majnemer, rnk.
hans added a subscriber: llvm-commits.

The REX prefix should be used on indirect jmps, but not direct ones.
For direct jumps, the unwinder looks at the offset to determine if
it's inside the current function.

https://reviews.llvm.org/D24359

Files:
  lib/Target/X86/X86ExpandPseudo.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrControl.td
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86MCInstLower.cpp
  test/CodeGen/X86/seh-catchpad.ll
  test/CodeGen/X86/tail-call-win64.ll
  test/CodeGen/X86/win64_sibcall.ll
  test/DebugInfo/COFF/register-variables.ll

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