[compiler-rt] [llvm] [TSan] Add dominance-based redundant instrumentation elimination (PR #169897)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

"Implementation Details" should be comments in the code, explaining relevant pieces.

PR description should focus on motivation, which looks good, but some parts are quite redundant.
E..g "Impact" vs "Motivation & Potential Impact"


https://github.com/llvm/llvm-project/pull/169897