Revert "[PGO] Make emitted symbols hidden"

This reverts commit 04877284b4592e9286cab43467662c1b4ff81861.
Looks like this is still breaking the test
Profile-x86_64 :: instrprof-darwin-dead-strip.c
(see comment on https://reviews.llvm.org/D135340).
GitOrigin-RevId: 76745d2b58b5931a2a591f3d876f08ddce7fec15
2 files changed