[RFC 07/14] Use define-macro in rtl.scm

rtl.scm uses defmacro:syntax-transformer, but that no longer exists in
more recent versions of Guile.

Replace these uses with define-macro -- which IMO is clearer anyway.

Note that defmacro could not be used here, as Guile's implementation
has a bug that prevents it from being used with non-canonical lists.
---
 rtl.scm | 37 +++++++++++++------------------------
 1 file changed, 13 insertions(+), 24 deletions(-)

diff --git a/rtl.scm b/rtl.scm
index c74fea1..beda406 100644
--- a/rtl.scm
+++ b/rtl.scm
@@ -283,12 +283,9 @@
       *UNSPECIFIED*))
 )
 
-(define define-rtx-node
-  ; Written this way so Hobbit can handle it.
-  (defmacro:syntax-transformer (lambda arg-list
-				 (apply def-rtx-node arg-list)
-				 nil))
-)
+(define-macro (define-rtx-node . args)
+  (cons 'def-rtx-node
+	(map (lambda (arg) `',arg) args)))
 
 ; Same as define-rtx-node but don't pre-evaluate the arguments.
 ; Remember that `mode' must be the first argument.
@@ -314,12 +311,9 @@
       *UNSPECIFIED*))
 )
 
-(define define-rtx-syntax-node
-  ; Written this way so Hobbit can handle it.
-  (defmacro:syntax-transformer (lambda arg-list
-				 (apply def-rtx-syntax-node arg-list)
-				 nil))
-)
+(define-macro (define-rtx-syntax-node . args)
+  (cons 'def-rtx-syntax-node
+	(map (lambda (arg) `',arg) args)))
 
 ; Same as define-rtx-node but return an operand (usually an <operand> object).
 ; ??? `mode' must be the first argument?
@@ -345,12 +339,9 @@
       *UNSPECIFIED*))
 )
 
-(define define-rtx-operand-node
-  ; Written this way so Hobbit can handle it.
-  (defmacro:syntax-transformer (lambda arg-list
-				 (apply def-rtx-operand-node arg-list)
-				 nil))
-)
+(define-macro (define-rtx-operand-node . args)
+  (cons 'def-rtx-operand-node
+	(map (lambda (arg) `',arg) args)))
 
 ; Convert one rtx expression into another.
 ; NAME-ARGS is a list of the operation name and arguments.
@@ -374,12 +365,10 @@
       *UNSPECIFIED*))
 )
 
-(define define-rtx-macro-node
-  ; Written this way so Hobbit can handle it.
-  (defmacro:syntax-transformer (lambda arg-list
-				 (apply def-rtx-macro-node arg-list)
-				 nil))
-)
+(define-macro (define-rtx-macro-node . args)
+  (cons 'def-rtx-macro-node
+	(map (lambda (arg) `',arg) args)))
+
 
 ; RTL macro expansion.
 ; RTL macros are different than pmacros.  The difference is that the expansion
-- 
2.41.0