Michael Liao dccfaacf93 [InferAddressSpaces] Handle the pair of ptrtoint/inttoptr.
Summary:
- `ptrtoint` and `inttoptr` are defined as no-op casts if the integer
  value as the same size as the pointer value. The pair of
  `ptrtoint`/`inttoptr` is in fact a no-op cast sequence between
  different address spaces. Teach `infer-address-spaces` to handle them
  like a `bitcast`.

Reviewers: arsenm, chandlerc

Subscribers: jvesely, wdng, nhaehnle, hiraditya, kerbowa, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D81938
2020-06-25 20:46:56 -04:00
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