/azp run STL-ASan-CI

Light is green, trap is clean (eventually): https://dev.azure.com/vclibs/STL/_build/results?buildId=17368&view=results

Light is green, trap is clean (eventually): https://dev.azure.com/vclibs/STL/_build/results?buildId=17368&view=results

Either we've been extremely lucky, or the sporadic x86 ASan failures have become less frequent since updating our toolset to 17.12p1.

A bunch of libc++ tests have been refactored to remove flakyness. They can probably be removed from expected_results.txt.

• [libc++] Refactor tests for shared_mutex and shared_timed_mutex llvm/llvm-project#100783
• [libc++] Refactor the std::unique_lock tests llvm/llvm-project#102151
• [libc++] Refactor the tests for mutex, recursive mutex and their timed counterparts llvm/llvm-project#104852

A bunch of libc++ tests have been refactored to remove flakyness. They can probably be removed from expected_results.txt.

• [libc++] Refactor tests for shared_mutex and shared_timed_mutex llvm/llvm-project#100783
• [libc++] Refactor the std::unique_lock tests llvm/llvm-project#102151
• [libc++] Refactor the tests for mutex, recursive mutex and their timed counterparts llvm/llvm-project#104852

I see a lot of removal of ALLOW_RETRIES, this looks like a righteous change. This PR is a rush job to meet an internal deadline, I'd rather reenable this test coverage in a followup PR.

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

I reported llvm/llvm-project#105966 and pushed an additional commit.