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Relanding r357928 with fixed debuginfo check.

Authored by akhuang on Apr 12 2019, 1:25 PM.

Description

Relanding r357928 with fixed debuginfo check.

[MS] Add metadata for __declspec(allocator)

Original summary:
Emit !heapallocsite in the metadata for calls to functions marked with
__declspec(allocator). Eventually this will be emitted as S_HEAPALLOCSITE debug
info in codeview.

Differential Revision: https://reviews.llvm.org/D60237

llvm-svn: 358307