remove most ifdef STACK_GROWS_DOWNWARD

remove most ifdef STACK_GROWS_DOWNWARD

gcc/c-family/ChangeLog:

2015-05-20  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* c-cppbuiltin.c (c_cpp_builtins): Use if instead of #if with
	STACK_GROWS_DOWNWARD.

gcc/ChangeLog:

2015-05-20  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* builtins.c, dwarf2cfi.c, explow.c, expr.c, recog.c,
	sched-deps.c: Use if instead of preprocessor checks with
	STACK_GROWS_DOWNWARD.

From-SVN: r223514