re PR target/44942 (Bug in argument passing of long double)

re PR target/44942 (Bug in argument passing of long double)

	PR target/44942
	* config/i386/i386-protos.h (ix86_function_arg_boundary): Change second
	argument to const_tree.
	* config/i386/i386.c (function_arg_advance): If padding needs to be
	inserted before argument, increment cum->words by number of padding
	words as well.
	(contains_aligned_value_p): Change argument to const_tree.
	(ix86_function_arg_boundary): Change second argument to const_tree.

	* gcc.c-torture/execute/pr44942.c: New test.
	* gcc.target/i386/pr44942.c: New test.

From-SVN: r162255