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[as] Don't use casecmp with bsearch()

We can convert to upper case the verb before begin
to compare. It will make faster all the comparisions
that is where the time will be consumed.

--- a/as/main.c

+++ b/as/main.c

@@ -15,19 +15,23 @@

 	const char *s = f1;

 	int d;

-	d = toupper(*ins->str) - toupper(*s);

-	if (d != 0)

+	if ((d = *s - *ins->str) != 0)

 		return d;

-	return casecmp(s, ins->str);

+	return strcmp(s, ins->str);

 }

 static void

 as(char *text, char *xargs)

 {

+	int c;

+	char *p;

 	Ins *ins;

 	Op *op, *lim;

 	Node **args;

+

+	for (p = text; c = *p; ++p)

+		*p = toupper(c);

 	ins = bsearch(text, instab, nr_ins, sizeof(Ins), cmp);

 	if (!ins) {