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cc1: Add an additional parameter to prtree()

This parameter helps to add more sensible information
in the debug output.

--- a/src/cmd/cc/cc1/cc1.h

+++ b/src/cmd/cc/cc1/cc1.h

@@ -458,7 +458,7 @@

 #define accept(t) ((yytoken == (t)) ? next() : 0)

 /* code.c */

-extern void prtree(Node *np);

+extern void prtree(char *s, Node *np);

 extern void emit(int, void *);

 extern Node *node(int op, Type *tp, Node *left, Node *rigth);

 extern Node *varnode(Symbol *sym);

--- a/src/cmd/cc/cc1/code.c

+++ b/src/cmd/cc/cc1/code.c

@@ -165,10 +165,10 @@

 }

 void

-prtree(Node *np)

+prtree(char *s, Node *np)

 {

 	outfp = stderr;

-	fputs("DBG prtree", outfp);

+	fprintf(outfp, "DBG prtree %s", s);

 	emitnode(np);

 	putc('\n', outfp);

 	outfp = stdout;

--- a/src/cmd/cc/cc1/fold.c

+++ b/src/cmd/cc/cc1/fold.c

@@ -637,8 +637,9 @@

 	if (!np)

 		return NULL;

+

 	if (enadebug)

-		prtree(np);

+		prtree("simplify", np);

 	l = np->left = simplify(np->left);

 	r = np->right = simplify(np->right);