testsuite, i386: add win64 AVX indirect alignment tests [PR54412]

On x86_64-w64-mingw32, PR target/54412 is triggered when AVX and
AVX512 values are passed or returned indirectly and GCC materializes
under-aligned stack storage for them.

Add run tests for the original by-value AVX cases, for isolated hidden
sret allocation and callee by-reference parameter materialization, and
for a dedicated aligned(64) AVX512 case.

gcc/testsuite/ChangeLog:

	PR target/54412
	* gcc.target/i386/pr54412-v4d-o0-aligned-locals.c: New test.
	* gcc.target/i386/pr54412-o2-by-value-cases.c: New test.
	* gcc.target/i386/pr54412-sret-no-args.c: New test.
	* gcc.target/i386/pr54412-callee-byref-param.c: New test.
	* gcc.target/i386/pr54412-avx512-aligned64.c: New test.

Signed-off-by: oltolm <oleg.tolmatcev@gmail.com>
Signed-off-by: Jonathan Yong <10walls@gmail.com>