Summary:
Otherwise, at least on Mac, the linker eliminates unused symbols which
causes libFuzzer to error out due to a mismatch of the sizes of coverage tables.
Issue in Chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=892167
Reviewers: morehouse, kcc, george.karpenkov
Reviewed By: morehouse
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D53113
llvm-svn: 344345