[PATCH] D55151: [gcov/Darwin] Ensure external symbols are exported when using an export list

[Vedant Kumar via Phabricator via cfe-commits]

vsk created this revision.
vsk added reviewers: ributzka, steven_wu, calixte, marco-c.

Make sure that symbols needed to implement runtime support for gcov are
exported when using an export list on Darwin.

Without the clang driver exporting these symbols, the linker hides them,
resulting in tapi verification failures.

rdar://45944768


https://reviews.llvm.org/D55151

Files:
  clang/include/clang/Driver/ToolChain.h
  clang/lib/Driver/ToolChain.cpp
  clang/lib/Driver/ToolChains/Darwin.cpp
  clang/test/Driver/darwin-ld.c
  compiler-rt/test/profile/instrprof-darwin-exports.c

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