PR c/456

	* cppexp.c (num_binary_op): Don't allow comma operators in #if
	constant expressions at all outside C99 mode if pedantic.

testsuite:
	* gcc.dg/cpp/c90-if-comma-1.c, gcc.dg/cpp/c99-if-comma-1.c:
	New tests.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@77676 138bc75d-0d04-0410-961f-82ee72b054a4