aarch64: Fix target/optimize option handling with transiting between O1 to O2

aarch64: Fix target/optimize option handling with transiting between O1 to O2

The problem here is the aarch64 backend enables -mearly-ra at -O2 and above but
it is not marked as an Optimization in the .opt file so enabling it sometimes
reset the target options when going from -O1 to -O2 for the first time.

Build and tested for aarch64-linux-gnu with no regressions.

	PR target/116065

gcc/ChangeLog:

	* config/aarch64/aarch64.opt (mearly-ra=): Mark as Optimization rather
	than Save.

gcc/testsuite/ChangeLog:

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

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