aarch64: Add testcase for vld2 which was fixed by r16-1113 [PR89606]

aarch64: Add testcase for vld2 which was fixed by r16-1113 [PR89606]

This aarch64 specific vld2 intrinsics testcase was fixed by r16-1113-g069caa5cea91f
(simple copy propagation for aggregates). I didn't include it in the original
patch as I was testing on x86_64 but I got around to testing this
and now we don't have any more extra movs so let's add a testcase.

Tested for aarch64-linux-gnu.

	PR tree-optimization/89606

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/vld2-1.c: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>