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[as] Move pack() to emit.c

It is better to keep ins.c files only for instruction formats

--- a/as/as.h

+++ b/as/as.h

@@ -56,6 +56,7 @@

 extern void emit(Section *sec, char *bytes, int nbytes);

 extern Section *section(char *name);

 extern void incpc(int siz);

+extern char *pack(TUINT v, int n, int inc);

 extern Section *cursec;

 extern int nr_ins;

--- a/as/emit.c

+++ b/as/emit.c

@@ -27,6 +27,21 @@

 int pass;

+char *

+pack(TUINT v, int n, int inc)

+{

+	static char buf[sizeof(TUINT)];

+	int idx;

+

+	idx = (inc < 0) ? n-1 : 0;

+	while (n--) {

+		buf[idx] = v;

+		idx += inc;

+		v >>= 8;

+	}

+	return buf;

+}

+

 static void

 isect(Section *sec)

 {

--- a/as/ins.c

+++ b/as/ins.c

@@ -8,21 +8,6 @@

 	emit(cursec, op->bytes, op->size);

 }

-char *

-pack(TUINT v, int n, int inc)

-{

-	static char buf[sizeof(TUINT)];

-	int idx;

-

-	idx = (inc < 0) ? n-1 : 0;

-	while (n--) {

-		buf[idx] = v;

-		idx += inc;

-		v >>= 8;

-	}

-	return buf;

-}

-

 void

 def(Arg *args, int siz)

 {