Run asan and lsan suites without -O2
#15176
Merged
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Running them in
-O2
means llvm does optimizations which can hidememory leaks (e.g. In some cases it can completely elinate calls
allocations due to malloc/new when the resulting pointer don't escape).
This should also speed up running these test suites.
Also, fix test_em_asm_2 under asan.
This change contains some parts that were split out from #15099.