gimple-fold: Recompute ADDR_EXPR flags after folding a TMR [PR98268]

gimple-fold: Recompute ADDR_EXPR flags after folding a TMR [PR98268]

The gimple verifier picked up that an ADDR_EXPR of a MEM_REF was not
marked TREE_CONSTANT even though the address was in fact invariant.
This came from folding a &TARGET_MEM_REF with constant operands to
a &MEM_REF; &TARGET_MEM_REF is never treated as TREE_CONSTANT
but &MEM_REF can be.

gcc/
	PR tree-optimization/98268
	* gimple-fold.c (maybe_canonicalize_mem_ref_addr): Call
	recompute_tree_invariant_for_addr_expr after successfully
	folding a TARGET_MEM_REF that occurs inside an ADDR_EXPR.

gcc/testsuite/
	PR tree-optimization/98268
	* gcc.target/aarch64/sve/pr98268-1.c: New test.
	* gcc.target/aarch64/sve/pr98268-2.c: Likewise.