[PATCH] D115672: Teach the backend to make references to swift_async_extendedFramePointerFlags weak if it emits it

[Arnold Schwaighofer via Phabricator via llvm-commits]

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When references to the symbol `swift_async_extendedFramePointerFlags`
are emitted they have to be weak.

References to the symbol `swift_async_extendedFramePointerFlags` get
emitted only by frame lowering code. Therefore, the backend needs to track
references to the symbol and mark them weak.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D115672

Files:
  llvm/include/llvm/CodeGen/AsmPrinter.h
  llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
  llvm/lib/Target/X86/X86AsmPrinter.h
  llvm/lib/Target/X86/X86MCInstLower.cpp
  llvm/test/CodeGen/AArch64/swift-dynamic-async-frame.ll
  llvm/test/CodeGen/X86/swift-dynamic-async-frame.ll

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