re PR target/63764 (ICE: in verify_ssa, at tree-ssa.c:939)

	PR target/63764
c-family/
	* c-common.h (convert_vector_to_pointer_for_subscript): Change
	return type to bool.
	* c-common.c: Include gimple-expr.c.
	(convert_vector_to_pointer_for_subscript): Change return type to
	bool.  If *vecp is not lvalue_p and has VECTOR_TYPE, return true
	and copy it into a TARGET_EXPR and use that instead of *vecp
	directly.
c/
	* c-typeck.c (build_array_ref): Adjust
	convert_vector_to_pointer_for_subscript caller.  If it returns true,
	call non_lvalue_loc on the result.
cp/
	* typeck.c (cp_build_array_ref): Adjust
	convert_vector_to_pointer_for_subscript caller.  If it returns true,
	call non_lvalue_loc on the result.
testsuite/
	* c-c++-common/pr63764-1.c: New test.
	* c-c++-common/pr63764-2.c: New test.

From-SVN: r217909