cppmacro.c (funlike_invocation_p): Move some logic to caller in enter_macro_context.

	* cppmacro.c (funlike_invocation_p): Move some logic to caller
	in enter_macro_context.  Create a padding token in its own context
	if necessary when the search for '(' fails.
	(enter_macro_context): Update.

	* gcc.dg/cpp/spacing1.c: Update test.

From-SVN: r46070