With eager-checks and msan-poison-stack-with-call enabled, this
saves ~1.5% instrumented binary size.
flag order is inconsistent
also line breaks with \ is unnecessary
long lines should be accepted by clang-format -style file in tests
I don't think 1.5% is good enough to introduce new runtime functions for the off-by-default code path.
I agree, this probably isn't going to be worth it.