There are three compiler bugs that influence this decision:
- Clang writing to (validly) destroyed coroutine frame with -O0 and
-fsanitize=null,address under some conditions
(https://godbolt.org/z/17Efq5Ma5) (AK_COROUTINE_DESTRUCTION_BROKEN);
- GCC being unable to handle statement expressions in coroutines
(AK_COROUTINE_STATEMENT_EXPRS_BROKEN);
- GCC being unable to deduce template type parameter for TryAwaiter
with nested CO_TRYs (AK_COROUTINE_TYPE_DEDUCTION_BROKEN).
Instead of growing an ifdef soup in AK/Coroutine.h and
LibTest/AsyncTestCase.h, define three macros in AK/Platform.h that
correspond to these bugs and use them accordingly in the said files.
