Adrian Vogelsgesang d7e0cec60e [libc++][test] Mark test_comparisons.h helpers as nodiscard
I accidentally wrote `testComparisons(...)` instead of
`assert(testComparisons(...))`. This compiled without issues, but
did not provide the intended test coverage. By adding a `nodiscard`,
we can make sure that the compiler catches such mistakes for us.

Differential Revision: https://reviews.llvm.org/D131364
2022-08-12 03:30:33 -07:00
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