[PATCH] D144749: [AbstractAttributor] Set up a dedicated simplification call back map for `GlobalVariable`

[Shilei Tian via Phabricator via llvm-commits]

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Currently we don't check call backs for global variable simplification.
What's more, the only way that we can register a simplification call back for
global variable is through its initializer (essentially a `Constant *`). It might
not correspond to the right global variable. In this patch, we set up a dedicated
simplification map for `GlobalVariable`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144749

Files:
  llvm/include/llvm/Transforms/IPO/Attributor.h
  llvm/lib/Transforms/IPO/Attributor.cpp

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