This test specifically checks that profiles are not mergeable if there's a
change in the CounterPtr in the profile header. The test manually changes
CounterPtr by explicitly calling memset on some offset into the profile file.
This test would fail if binary IDs were emitted because the offset calculation
does not take into account the binary ID sizes.
This patch updates the test to use types provided in profile/InstrProfData.inc
to make it more resistant to profile layout changes.
Differential Revision: https://reviews.llvm.org/D110277
Revert "[profile] Change linkage type of a compiler-rt func"
This reverts commits f984ac2715f71c38a7872fa2c2ad535b3d4fa285 and
467c7191249b76abff33853b1692a77f327c2422 because it broke some builds.
This mostly follows LLVM's InstrProfReader.cpp error handling.
Previously, attempting to merge corrupted profile data would result in
crashes. See https://crbug.com/1216811#c4.
Reviewed By: rnk
Differential Revision: https://reviews.llvm.org/D104050
