* md.texi (Simple Constraints): Add item about whitespace.

	* genoutput.c (strip_whitespace): New.
	(scan_operands) [MATCH_OPERAND, MATCH_SCRATCH]: Call
	strip_whitespace for constraints.
	Test pointer using NULL, not 0.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@32008 138bc75d-0d04-0410-961f-82ee72b054a4