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Expose symbols in lib/libclang_rt/profile to fix --coverage

Description

Expose symbols in lib/libclang_rt/profile to fix --coverage

The symbols currently hidden in libprofile_rt are needed for linking with
clang --coverage to add coverage counters at link time and produce
coverage numbers at runtime.

In collaboration with: dim
MFC after: 1 month
Sponsored by: Dell EMC Isilon
Differential Revision: D9168