[stack-safety] Inter-Procedural Analysis implementation

Summary:
IPA is implemented as module pass which produce map from Function or Alias to
StackSafetyInfo for a single function.

From prototype by Evgenii Stepanov and Vlad Tsyrklevich.

Reviewers: eugenis, vlad.tsyrklevich, pcc, glider

Subscribers: hiraditya, mgrang, llvm-commits

Differential Revision: https://reviews.llvm.org/D54543

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@347611 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed