PR tree-optimization/60823
	* omp-low.c (ipa_simd_modify_function_body): Go through
	all SSA_NAMEs and for those refering to vector arguments
	which are going to be replaced adjust SSA_NAME_VAR and,
	if it is a default definition, change it into a non-default
	definition assigned at the beginning of function from new_decl.
	(ipa_simd_modify_stmt_ops): Rewritten.
	* tree-dfa.c (set_ssa_default_def): When removing default def,
	check for NULL loc instead of NULL *loc.

	* c-c++-common/gomp/pr60823-1.c: New test.
	* c-c++-common/gomp/pr60823-2.c: New test.
	* c-c++-common/gomp/pr60823-3.c: New test.

From-SVN: r209616