[PATCH] D98701: StackProtector: insert check before `musttail` call.

[Tim Northover via Phabricator via llvm-commits]

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`musttail` calls have to directly precede the return instruction (of their value), so any stack checks must be inserted before the call instead of in between it and the return. Fortunately this same restriction means we don't have to look too hard to find out if we're about to break a `musttail` call.


https://reviews.llvm.org/D98701

Files:
  llvm/lib/CodeGen/StackProtector.cpp
  llvm/test/CodeGen/AArch64/stack-protector-musttail.ll
  llvm/test/CodeGen/ARM/Windows/stack-protector-musttail.ll

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