[PATCH] D123284: [ArgPromotion][Attributor] Update min-legal-vector-width when do promotion

[Phoebe Wang via Phabricator via llvm-commits]

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X86 codegen uses min-legal-vector-width to decide the proper ABI level.
So we should always make sure the attribute reflects the correct vector
width when doing argument promotion.

Here are failed case: https://godbolt.org/z/zo3hba8xW


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123284

Files:
  llvm/include/llvm/IR/Attributes.h
  llvm/lib/IR/Attributes.cpp
  llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
  llvm/lib/Transforms/IPO/Attributor.cpp
  llvm/test/Transforms/ArgumentPromotion/byval-3.ll
  llvm/test/Transforms/Attributor/ArgumentPromotion/X86/min-legal-vector-width.ll

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