Ting Wang ee703b5cb1 [clang][PowerPC] PPC64 VAArg fix right-alignment for aggregates fit in register
PPC64 ABI pass aggregates smaller than a register into the least
significant bits of the register. In the case of variadic functions,
they will end up right-aligned in their argument slots in the argument
area on big-endian targets. Apply right-alignment for these aggregates.

Fixes #55900.

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D133338
2022-10-16 22:01:47 -04:00
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