PR tree-optimization/32589

	PR tree-optimization/32589
	* doc/tree-ssa.texi (Rough GIMPLE Grammar): Add missing rule.
	* tree-gimple.c (is_gimple_min_invariant): Clarify head comment.
	* tree-ssa-propagate.c (valid_gimple_expression_p): New
	predicate, extracted from...
	(set_rhs): ...here.  Call it for the expression on entry.
	* tree-ssa-propagate.h (valid_gimple_expression_p): Declare.
	* tree-ssa-sccvn.c: Include tree-ssa-propagate.h.
	(simplify_binary_expression): Use valid_gimple_expression_p
	to validate the simplification.
	* Makefile.in (tree-ssa-sccvn.o): Depends on tree-ssa-propagate.h.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@126545 138bc75d-0d04-0410-961f-82ee72b054a4