[AArch64] PR target/70002: Make aarch64_set_current_function play nice with pragma...

[AArch64] PR target/70002: Make aarch64_set_current_function play nice with pragma resetting

	PR target/70002
	* config/aarch64/aarch64-protos.h
	(aarch64_save_restore_target_globals): New prototype.
	* config/aarch64/aarch64-c.c (aarch64_pragma_target_parse):
	Call the above when popping pragma.
	* config/aarch64/aarch64.c (aarch64_save_restore_target_globals):
	New function.
	(aarch64_set_current_function): Rewrite using the above.

	PR target/70002
	PR target/69245
	* gcc.target/aarch64/pr69245_2.c: New test.

From-SVN: r234141