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[as] Add skeleton to check size of IMM operands

At this moment this check is not performed, but the call to
the correct function is added.

--- a/as/as.h

+++ b/as/as.h

@@ -108,6 +108,7 @@

 extern Section *section(char *name);

 extern Symbol *tmpsym(TUINT val);

 extern void killtmp(void);

+extern int toobig(Node *np, int type);

 /* main.c */

 extern Symbol *lookup(char *name, int type);

--- a/as/symbol.c

+++ b/as/symbol.c

@@ -115,6 +115,13 @@

 	return sym;

 }

+int

+toobig(Node *np, int type)

+{

+	/* TODO */

+	return 0;

+}

+

 char *

 pack(TUINT v, int n, int inc)

 {

--- a/as/target/z80/proc.c

+++ b/as/target/z80/proc.c

@@ -71,6 +71,8 @@

 			np = *args++;

 			if (np->addr != AIMM)

 				return 0;

+			if (toobig(np, arg))

+				return 0;

 			break;

 		default:

 			abort();