PR c/38483
	* builtins.c (gimplify_va_arg_expr): Evaluate the va_list
	expression before any __builtin_trap call.
	* c-typeck.c (build_function_call): Convert and check function
	arguments before generating a call to a trap.  Evaluate the
	function arguments before the trap.

testsuite:
	* gcc.c-torture/execute/call-trap-1.c,
	gcc.c-torture/execute/va-arg-trap-1.c, gcc.dg/call-diag-1.c: New
	tests.

From-SVN: r144296