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[as] Reduce the number of calls to casecmp()

In both cases the common case is to have a different first letter,
so this small optimize improves a lot the performance in both cases.

--- a/as/main.c

+++ b/as/main.c

@@ -1,5 +1,6 @@

 static char sccsid[] = "@(#) ./as/main.c";

+#include <ctype.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

@@ -17,8 +18,14 @@

 cmp(const void *f1, const void *f2)

 {

 	const Ins *ins = f2;

+	const char *s = f1;

+	int d;

-	return casecmp(f1, ins->str);

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

+	if (d != 0)

+		return d;

+

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

 }

 static void

--- a/as/symbol.c

+++ b/as/symbol.c

@@ -56,11 +56,11 @@

 		h = h*33 ^ c;

 	h &= HASHSIZ-1;

-	c = *name;

+	c = toupper(*name);

 	list = &hashtbl[h];

 	for (sym = *list; sym; sym = sym->next) {

 		t = sym->name;

-		if (c == *t && !casecmp(t, name))

+		if (c == toupper(*t) && !casecmp(t, name))

 			return sym;

 	}