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[cc2] Convert optimize into an apply function

This change makes the code more regular.

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -186,7 +186,7 @@

 extern void parse(void);

 /* optm.c */

-extern void optimize(void);

+extern Node *optm(Node *np);

 /* cgen.c */

 extern Node *sethi(Node *np);

--- a/cc2/main.c

+++ b/cc2/main.c

@@ -38,7 +38,7 @@

 	while (moreinput()) {

 		parse();

-		optimize();

+		apply(optm);

 		apply(sethi);

 		apply(cgen);

 		peephole();

--- a/cc2/optm.c

+++ b/cc2/optm.c

@@ -2,7 +2,8 @@

 #include "arch.h"

 #include "cc2.h"

-void

-optimize(void)

+Node *

+optm(Node *np)

 {

+	return np;

 }