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[as] Add end pseudo instruction

This pseudo instruction finishes the processing of the current
file. It allows to add free format comments after it.

--- a/as/as.h

+++ b/as/as.h

@@ -195,3 +195,4 @@

 extern int endian;

 extern Symbol *linesym, *symlist;

 extern char *infile;

+extern int endpass;

--- a/as/ins.c

+++ b/as/ins.c

@@ -235,3 +235,9 @@

 	for (al = pc - curpc; al > 0; --al)

 		emit((char []) {0}, 1);

 }

+

+void

+end(Op *op, Node **args)

+{

+	endpass = 1;

+}

--- a/as/main.c

+++ b/as/main.c

@@ -12,6 +12,7 @@

 char *argv0;

 char *outfile, *infile;

+int endpass;

 static void

@@ -77,8 +78,9 @@

 		die("as: error opening '%s'", fname);

 	cleansecs();

+	endpass = 0;

 	setjmp(recover);

-	while (nextline(fp, &line)) {

+	while (!endpass && nextline(fp, &line)) {

 		linesym = NULL;

 		if (line.label)

--- a/as/target/x80/x80.dat

+++ b/as/target/x80/x80.dat

@@ -31,6 +31,7 @@

 .STRING	string+	0	none	string	Z80,R800,GB80

 .ASCII	string+	0	none	ascii	Z80,R800,GB80

 .ALIGN	imm16+	0	none	align	Z80,R800,GB80

+.END	none	0	none	end	Z80,R800,GB80

 NOP	none	1	0x00	noargs	Z80,R800,GB80

 EI	none	1	0xfb	noargs	Z80,R800,GB80