[PATCH] D155193: [LangRef] vscale_range implies the vscale is power-of-two

[Allen zhong via Phabricator via llvm-commits]

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According the discuss on D154953 <https://reviews.llvm.org/D154953>, we need to make the LangRef change
before the optimization relied on the new behaviour:

      vscale_range implies vscale is a power-of-two value, parse of the
  attribute to reject values that are not a power-of-two.


https://reviews.llvm.org/D155193

Files:
  llvm/docs/BitCodeFormat.rst
  llvm/docs/LangRef.rst
  llvm/lib/IR/Verifier.cpp
  llvm/test/Transforms/InstCombine/icmp-vscale.ll
  llvm/test/Transforms/InstCombine/vscale_sext_and_zext.ll
  llvm/test/Transforms/InstCombine/vscale_trunc.ll
  llvm/test/Verifier/vscale_range.ll

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