MT#55283 use const for gperf data

Might allow the compiler to do some extra optimisations

Change-Id: I836f5a6502964c1285553e92ad1d9a98a50766e4

utils/const_str_hash

@@ -37,7 +37,7 @@ while (my $line = <STDIN>) {
 # pass collected output to gperf
 
 my ($rd, $wr);
-my $pid = open2($rd, $wr, qw(gperf -t -E -l -c -t -I -H __csh_hash -N __csh_lookup_raw));
+my $pid = open2($rd, $wr, qw(gperf -t -E -l -c -I -C -H __csh_hash -N __csh_lookup_raw));
 
 # gperf header and keys
 
@@ -58,7 +58,7 @@ exit(1) if $?;
 
 # convert lookup function to static
 
-$hash_func_code =~ s/(^|\s)struct\s+__csh_hash_lookup\s*\*/\nstatic$&/s;
+$hash_func_code =~ s/(^|\s)(const\s+)?struct\s+__csh_hash_lookup\s*\*/\nstatic$&/s;
 
 # print combined output
 
@@ -72,7 +72,7 @@ print <<END;
 static int __csh_lookup(const str *s) {
 	if (!s->s)
 		return -1;
-	struct __csh_hash_lookup *h = __csh_lookup_raw(s->s, s->len);
+	const struct __csh_hash_lookup *h = __csh_lookup_raw(s->s, s->len);
 	if (!h)
 		return -1;
 	return h->num;