* builtins.c (interclass_mathfn_icode): New helper.
	(expand_builtin_interclass_mathfn): Use it here, and split folding
	into ...
	(fold_builtin_interclass_mathfn): ... this new folder.
	(build_call_nofold_loc): New static helper.
	(build_call_nofold): New wrapper macro for above.
	(expand_builtin_int_roundingfn): Use it instead of build_call_expr.
	(expand_builtin_pow): Ditto.
	(expand_builtin_memset_args): Ditto.
	(expand_builtin_printf): Ditto.
	(expand_builtin_fprintf): Ditto.
	(expand_builtin_sprintf): Ditto.
	(expand_builtin_memory_chk): Ditto.
	(expand_builtin_mempcpy_args): Ditto and don't call folders.
	(expand_builtin_stpcpy): Ditto.
	(expand_builtin_strcmp): Ditto.
	(expand_builtin_strncmp): Ditto.
	(expand_builtin_strcpy): Remove FNDECL and MODE arguments.
	(expand_builtin_strcpy_args): Don't call folders.
	(expand_builtin_memcmp): Ditto.
	(expand_builtin_strncpy): Ditto, and use target.
	(expand_builtin_memcpy): Ditto.
	(expand_builtin_strstr, expand_builtin_strchr, expand_builtin_strrchr,
	expand_builtin_strpbrk, expand_builtin_memmove,
	expand_builtin_memmove_args, expand_builtin_bcopy,
	expand_builtin_memchr, expand_builtin_strcat, expand_builtin_strncat,
	expand_builtin_strspn, expand_builtin_strcspn,
	expand_builtin_fputs): Remove these.
	(expand_builtin): Don't call the above, change calls to other
	expanders that changed prototype.
	(fold_builtin_stpcpy): New folder split out from expand_builtin_stpcpy.
	(fold_builtin_1 <ISFINITE, ISINF, ISNORMAL>): Call
	fold_builtin_interclass_mathfn.
	(fold_builtin_2 <STPCPY>): Call fold_builtin_stpcpy.
	(fold_builtin_strcat): Add folding split from expand_builtin_strcat.

	* fold-const.c (fold_binary_loc <NE_EXPR>): Add !exp != 0 -> !exp.
	* passes.c (init_optimization_passes): Move pass_fold_builtins
	after last phiopt pass.
	* tree-inline.c (fold_marked_statements): When folding builtins
	iterate over all instruction potentially generated.
	* tree-ssa-ccp.c (gimplify_and_update_call_from_tree): Declare
	earlier.
	(fold_gimple_call): Use it to always fold calls (into potentially
	multiple instructions).
	* tree-ssa-dom.c (optimize_stmt): Resolve __builtin_constant_p
	calls into zero at this time.
	* tree-ssa-propagate.c (substitute_and_fold): Ignore multiple 
	statements generated by builtin folding.

testsuite/
	* gcc.dg/builtins-44.c: Use __builtin_isinf_sign when checking
	for sign of -Inf.

From-SVN: r152236