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Add type field in Symbols

This field is necessary if we want to know what we have.

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -1,6 +1,7 @@

 typedef struct symbol {

 	char public;

+	char type;

 	struct symbol *next;

 	union {

 		struct {

@@ -46,6 +47,7 @@

 };

 #define FUNCTION   0

+#define VARIABLE   1

 #define AUTO      'A'

 #define REGISTER  'R'

 #define STATIC    'T'

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -208,6 +208,7 @@

 	case 'G': case 'R': case 'T':

 		break;

 	}

+	sym->type = VARIABLE;

 	sym->u.v.storage = class;

 	sym->u.v.type = gettype(strtok(NULL, "\t"));

 }

@@ -218,6 +219,7 @@

 	Symbol *sym;

 	sym = local(token);

+	sym->type = LABEL;

 	sym->u.l.addr = listp - listexp;

 }

@@ -228,6 +230,7 @@

 	curfun = global(token);

 	if ((token = strtok(NULL, "\t")) == NULL)

 		error(ESYNTAX);

+	curfun->type = FUNCTION;

 	curfun->u.f.name = xstrdup(token);

 	listp = listexp;

 	newp = nodepool;