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Improve assign() in cc2

Once a value is assigned, left and righ nodes contain the same
content, so both nodes (and the parent) contain a correct value
for the symbol (if any), so any of them can be used instead of
the symbol.

--- a/cc2/cgen.c

+++ b/cc2/cgen.c

@@ -333,6 +333,7 @@

 		case AUTO:

 			if (rp->op != REG)

 				move(rp, np);

+			lp->reg = rp->reg;

 			code(LDL, lp, rp);

 			break;

 		case REG:

@@ -346,10 +347,10 @@

 		abort();

 	}

-	lp->used = 1;

 	np->op = REG;

-	np->reg = rp->reg;

-	np->sym = lp->sym;

+	np->reg = lp->reg;

+	np->sym = rp->sym = lp->sym;

+	np->used = rp->used = lp->used = 1;

 }

 static void