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[cc2] Add newlabel()

This function is going to be useful in different targets and in a lot of
different situations, so it is a good idea to have it in cc2/code.c.

--- a/cc2/arch/qbe/cgen.c

+++ b/cc2/arch/qbe/cgen.c

@@ -410,11 +410,8 @@

 	case OBRANCH:

 		next = np->next;

 		load(np, LOADL);

-		if (next->label) {

-			sym = getsym(TMPSYM);

-			sym->kind = SLABEL;

-			next->label = sym;

-		}

+		if (!next->label)

+			next->label = newlabel();

 		ifyes = label2node(np->u.sym);

 		ifno = label2node(next->label);

 		op = ASBRANCH;

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -207,6 +207,7 @@

 extern void defvar(Symbol *), defpar(Symbol *), defglobal(Symbol *);

 extern void setlabel(Symbol *sym);

 extern Node *label2node(Symbol *sym);

+extern Symbol *newlabel(void);

 /* node.c */

 #define SETCUR  1

--- a/cc2/code.c

+++ b/cc2/code.c

@@ -57,6 +57,15 @@

 	}

 }

+Symbol *

+newlabel(void)

+{

+	Symbol *sym = getsym(TMPSYM);

+

+	sym->kind = SLABEL;

+	return sym;

+}

+

 Node *

 label2node(Symbol *sym)

 {