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[as] Add a list for symbols

This list is needed to run over all the symbols
defined in the object file.

--- a/as/as.h

+++ b/as/as.h

@@ -95,11 +95,11 @@

 struct symbol {

 	String name;

 	unsigned char flags;

-	char pass;

-	char argtype;

-	short desc;

+	unsigned char pass;

+	unsigned char argtype;

 	TUINT value;

 	struct symbol *next;

+	struct symbol *hash;

 };

 struct node {

@@ -154,5 +154,5 @@

 extern int pass;

 extern TUINT maxaddr;

 extern int endian;

-extern Symbol *linesym;

+extern Symbol *linesym, *symlist;

 extern char *filename;

--- a/as/symbol.c

+++ b/as/symbol.c

@@ -41,7 +41,7 @@

 static Symbol *hashtbl[HASHSIZ];

 static Alloc *tmpalloc;

-Symbol *linesym;

+Symbol *linesym, *symlist;

 #ifndef NDEBUG

 void

@@ -55,7 +55,7 @@

 			continue;

 		fprintf(stderr, "[%d]", (int) (bp - hashtbl));

-		for (sym = *bp; sym; sym = sym->next) {

+		for (sym = *bp; sym; sym = sym->hash) {

 			fprintf(stderr, " -> %s:%0X:%0X",

 			       sym->name.buf, sym->flags, sym->argtype);

 		}

@@ -79,7 +79,7 @@

 	c = toupper(*name);

 	list = &hashtbl[h];

-	for (sym = *list; sym; sym = sym->next) {

+	for (sym = *list; sym; sym = sym->hash) {

 		t = sym->name.buf;

 		if (c != toupper(*t) || casecmp(t, name))

 			continue;

@@ -92,12 +92,11 @@

 	sym = xmalloc(sizeof(*sym));

 	sym->name = newstring(name);

 	sym->flags = FLOCAL | FUNDEF | type;

-	sym->desc = 0;

 	sym->value = 0;

-	sym->next = *list;

-	*list = sym;

+	sym->hash = *list;

+	sym->next = symlist;

-	return sym;

+	return symlist = *list = sym;

 }

 Symbol *