Simplify some conditions related to [LW]Lock in generate-wait_event_types.pl

The first check on the enum values was not necessary as the values set
in wait_event_names.txt for the classes LWLock and Lock were able to
satisfy the check.  The second check when generating the C and header
files is now based on a match of the class names, making it simpler to
understand.

Author: Masahiro Ikeda, Michael Paquier
Discussion: https://postgr.es/m/eaf82a85c0ef1b55dc3b651d3f7b867a@oss.nttdata.com

src/backend/utils/activity/generate-wait_event_types.pl

@@ -85,13 +85,8 @@ foreach my $line (@lines_sorted)
 	my $trimmedwaiteventname = $waiteventenumname;
 	$trimmedwaiteventname =~ s/^WAIT_EVENT_//;
 
-	# An exception is required for LWLock and Lock as these don't require
-	# any C and header files generated.
 	die "wait event names must start with 'WAIT_EVENT_'"
-	  if ( $trimmedwaiteventname eq $waiteventenumname
-		&& $waiteventenumname !~ /^LWLock/
-		&& $waiteventenumname !~ /^Lock/);
-	$continue = ",\n";
+	  if ($trimmedwaiteventname eq $waiteventenumname);
 	push(@{ $hashwe{$waitclassname} }, @waiteventlist);
 }
 
@@ -141,8 +136,8 @@ if ($gen_code)
 		# Don't generate .c and .h files for LWLock and Lock, these are
 		# handled independently.
 		next
-		  if ( $waitclass =~ /^WaitEventLWLock$/
-			|| $waitclass =~ /^WaitEventLock$/);
+		  if ( $waitclass eq 'WaitEventLWLock'
+			|| $waitclass eq 'WaitEventLock');
 
 		my $last = $waitclass;
 		$last =~ s/^WaitEvent//;