Fangrui Song 68745a557e [InstrProfiling] Use llvm.compiler.used if applicable for Mach-O ...

Similar to D97585.

D25456 used `S_ATTR_LIVE_SUPPORT` to ensure the data variable will be retained
or discarded as a unit with the counter variable, so llvm.compiler.used is
sufficient. It allows ld to dead strip unneeded profc and profd variables.

Reviewed By: vsk

Differential Revision: https://reviews.llvm.org/D105445

2021-09-01 14:46:51 -07:00

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