* semantics.scm (semantic-compile): Change arg sem-code-list to

	* semantics.scm (semantic-compile): Change arg sem-code-list to
	sem-code.
	(semantic-attrs): Ditto.
	* iformat.scm (ifmt-analyze): Update.
	(ifmt-compute!): Update.
	* rtl-traverse.scm (-compile-expr-fn, rtx-compile): Move to
	rtl-xform.scm.
	(-rtx-trim-args, -rtx-trim-for-doc, rtx-trim-for-doc): Ditto.
	* rtl.scm (-rtx-canonicalize-expr, rtx-canonicalize): Ditto.
	* semantics.scm (rtx-simplify): Ditto.
	(rtx-const-equal, rtx-const-list-equal): Ditto, and make local.
	(rtx-simplify-eq-attr-mach, rtx-simplify-eq-attr-insn): Ditto.
	(-simplify-expr-fn): Move to rtl-xform.scm.
	(-solve-expr-fn, rtx-solve): Ditto.
	* rtl-xform.c: New file.
	* read.scm: Load it.