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[MS] Emit S_HEAPALLOCSITE debug info

Authored by akhuang on Apr 19 2019, 2:09 PM.

Description

[MS] Emit S_HEAPALLOCSITE debug info

Summary:
This emits labels around heapallocsite calls and S_HEAPALLOCSITE debug
info in codeview. Currently only changes FastISel, so emitting labels still
needs to be implemented in SelectionDAG.

Reviewers: hans, rnk

Subscribers: aprantl, hiraditya, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D60800

llvm-svn: 358783