tree-ssa-ccp.c (evaluate_stmt): Try bitwise tracking for builtin calls even if likelyvalue is not CONSTANT.

	* tree-ssa-ccp.c (evaluate_stmt): Try bitwise tracking for
	builtin calls even if likelyvalue is not CONSTANT.
	Handle BUILT_IN_STRDUP and BUILT_IN_STRNDUP like BUILT_IN_MALLOC.
	Return get_value_for_expr of first operand
	for BUILT_IN_{MEM{CPY,MOVE,SET},STR{,N}CPY}{,_CHK}.
	* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Handle
	BUILT_IN_{MEM{{,P}CPY,MOVE,SET},STR{,N}C{PY,AT},STPCPY}_CHK like
	their non-checking counterparts.
	(call_may_clobber_ref_p_1): Likewise.
	(stmt_kills_ref_p_1): Handle BUILT_IN_MEM{{,P}CPY,MOVE,SET}_CHK
	like their non-checking counterparts.
	* tree-ssa-structalias.c (find_func_aliases_for_builtin_call):
	Handle BUILT_IN_{MEM{{,P}CPY,MOVE,SET},STR{,N}C{PY,AT},STPCPY}_CHK
	like their non-checking counterparts.
	(find_func_clobbers): Likewise.
	* tree-ssa-dce.c (propagate_necessity): Handle BUILT_IN_MEMSET_CHK
	like BUILT_IN_MEMSET and BUILT_IN_CALLOC like BUILT_IN_MALLOC.

From-SVN: r175290