Sema: make source location in checkCallConvSupportsVarArgs more meaningful

As calling convention may not be specified explicitly in the source,
so use va_arg's location instead.

Signed-off-by: Tw <tw19881113@gmail.com>
d7b93c7876Tw committed on 2/17/2025, 4:28:11 AM· committed by Alex Rønne Petersenparent86064e6
2 files changedLine totals unavailable