[PATCH] D61960: [AArch64] only indicate CFI on Windows if we emitted CFI

[Nathan Froyd via Phabricator via llvm-commits]

froydnj created this revision.
froydnj added reviewers: mstorsjo, eli.friedman.
Herald added subscribers: llvm-commits, kristof.beyls, javed.absar.
Herald added a project: LLVM.

Otherwise, we emit directives for CFI without any actual CFI opcodes to
go with them, which causes tools to malfunction.  The technique is
similar to what the x86 backend already does.

Fixes https://bugs.llvm.org/show_bug.cgi?id=40876


Repository:
  rL LLVM

https://reviews.llvm.org/D61960

Files:
  lib/Target/AArch64/AArch64FrameLowering.cpp
  lib/Target/AArch64/AArch64InstrInfo.cpp
  lib/Target/AArch64/AArch64InstrInfo.h
  test/CodeGen/AArch64/win64-nocfi.ll

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