[PATCH] D128525: Test and document stackmap corner case: when the fram size isn't statically known

[Edd Barrett via Phabricator via llvm-commits]

vext01 created this revision.
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When a function does a dynamic stack allocation, is it impossible to know the size of the stack statically. If such a function uses stackmaps, then the stack size field is populated with `UINT64_MAX` to indicate this, however this is not tested or documented.

This change tests and documents this case.

Brought to my attention by @ptersilie , thanks.


https://reviews.llvm.org/D128525

Files:
  llvm/docs/StackMaps.rst
  llvm/test/CodeGen/AArch64/stackmap-dynamic-alloca.ll
  llvm/test/CodeGen/SystemZ/stackmap-dynamic-alloca.ll
  llvm/test/CodeGen/X86/stackmap-dynamic-alloca.ll

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