aarch64: Fix expansion of svsudot [PR114607]

aarch64: Fix expansion of svsudot [PR114607]

Not sure how this happend, but: svsudot is supposed to be expanded
as USDOT with the operands swapped.  However, a thinko in the
expansion of svsudot meant that the arguments weren't in fact
swapped; the attempted swap was just a no-op.  And the testcases
blithely accepted that.

gcc/
	PR target/114607
	* config/aarch64/aarch64-sve-builtins-base.cc
	(svusdot_impl::expand): Fix botched attempt to swap the operands
	for svsudot.

gcc/testsuite/
	PR target/114607
	* gcc.target/aarch64/sve/acle/asm/sudot_s32.c: New test.