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[cc2] Use NNODESinstead of NSYMBOLS

This is an error due to the first arena implementation was done in symbol.c.

--- a/cc2/node.c

+++ b/cc2/node.c

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

 #include "arch.h"

 #include "cc2.h"

-#define NSYMBOLS   32

+#define NNODES   32

 Symbol *curfun;

@@ -28,10 +28,10 @@

 	if (!freep) {

 		ap = xmalloc(sizeof(*ap));

-		ap->mem = xcalloc(NSYMBOLS, sizeof(Node));

+		ap->mem = xcalloc(NNODES, sizeof(Node));

 		ap->next = arena;

 		arena = ap;

-		for (np = ap->mem; np < &ap->mem[NSYMBOLS-1]; ++np)

+		for (np = ap->mem; np < &ap->mem[NNODES-1]; ++np)

 			np->left = np+1;

 		np->left = NULL;

 		freep = np;