aarch64/testsuite: Add testcases for recently fixed PRs

aarch64/testsuite: Add testcases for recently fixed PRs

The commit for PR 116258, added a x86_64 specific testcase,
I thought it would be a good idea to add an aarch64 testcase too.
And since it also fixed VLA vectors too so add a SVE testcase.

Pushed as obvious after a test for aarch64-linux-gnu.

	PR middle-end/116258
	PR middle-end/116259

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/pr116258.c: New test.
	* gcc.target/aarch64/sve/pr116259-1.c: New test.

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