aarch64: Fix early ra for -fno-delete-dead-exceptions [PR116927]

Early-RA was considering throwing instructions as being dead and removing
them even if -fno-delete-dead-exceptions was in use. This fixes that oversight.

Built and tested for aarch64-linux-gnu.

	PR target/116927

gcc/ChangeLog:

	* config/aarch64/aarch64-early-ra.cc (early_ra::is_dead_insn): Insns
	that throw are not dead with -fno-delete-dead-exceptions.

gcc/testsuite/ChangeLog:

	* g++.dg/torture/pr116927-1.C: New test.

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