Vitaly Buka eaa71a97f9 [clang] Add optional pass to remove UBSAN traps using PGO (#84214) ...

With #83471 it reduces UBSAN overhead from 44% to 6%.
Measured as "Geomean difference" on "test-suite/MultiSource/Benchmarks"
with PGO build.

On real large server binary we see 95% of code is still instrumented,
with 10% -> 1.5% UBSAN overhead improvements. We can pass this test only
with subset of UBSAN, so base overhead is smaller.

We have followup patches to improve it even further.

2024-03-11 12:07:28 -07:00

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