* rtl.def (SS_ASHIFT, SS_NEG): New codes.

	* doc/rtl.texi: Document them.
	* simplify-rtx.c (simplify_unary_operation,
	simplify_binary_operation_1): Don't abort when we see them.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@113227 138bc75d-0d04-0410-961f-82ee72b054a4