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[cc2] Add locals at the end of the list

We were inserting always in the head of the list, and it means
that the list had inverse order. This patch modifies it and
now the symbols are inserted at the end of the list.

--- a/cc2/symbol.c

+++ b/cc2/symbol.c

@@ -11,7 +11,7 @@

 #define NR_SYMHASH  64

-static Symbol *symtab[NR_SYMHASH];

+static Symbol *symtab[NR_SYMHASH], *curlocal;

 static Symbol *locals;

 static int infunction;

@@ -40,7 +40,7 @@

 		symtab[sym->id & NR_SYMHASH-1] = sym->h_next;

 		freesym(sym);

 	}

-	locals = NULL;

+	curlocal = locals = NULL;

 }

 Symbol *

@@ -59,11 +59,12 @@

 	if (!sym) {

 		sym = xcalloc(1, sizeof(*sym));

 		sym->id = id;

-		if (!infunction) {

-			sym->next = NULL;

-		} else {

-			sym->next = locals;

-			locals = sym;

+		if (infunction) {

+			if (!locals)

+				locals = sym;

+			if (curlocal)

+				curlocal->next = sym;

+			curlocal = sym;

 		}

 		sym->h_next = *htab;

 		*htab = sym;