[compiler-rt] [llvm] Add cmake option to enable/disable searching PATH for symbolizer (PR #129012)

[Hubert Tong via llvm-commits]

hubert-reinterpretcast wrote:

> addressed by setting *_SYMBOLIZER_PATH for sanitizers
> If things look good we can set it for review

Please add a test to `sanitizer_common` to check that PATH is not searched when the flag is set (can look in the verbose output of the sanitizer runtime for that). To do so, you will need to unset the applicable `*_SYMBOLIZER_PATH` in the test.

https://github.com/llvm/llvm-project/pull/129012