PR107920: Fix handling of virtual operands and disable folding for -fnon-call-exceptions.

gcc/ChangeLog:
	PR target/107920
	* config/aarch64/aarch64-sve-builtins-base.cc: Use
	gsi_replace_with_seq_vops to handle virtual operands, and gate
	the transform on !flag_non_call_exceptions.
	* gimple-fold.cc (gsi_replace_with_seq_vops): Make function non static.
	* gimple-fold.h (gsi_replace_with_seq_vops): Declare.

gcc/testsuite/ChangeLog:
	PR target/107920
	* gcc.target/aarch64/sve/acle/general/pr107920.c: New test.
	* g++.target/aarch64/sve/pr107920.C: Likewise.