Ensure we do not create goto labels with a "-" inside

Author: thekid

src/main/php/lang/ast/emit/PHP56.class.php

@@ -35,7 +35,7 @@ protected function returnType($name) {
 
   protected function catches($catch) {
     $last= array_pop($catch[0]);
-    $label= 'c'.crc32($last);
+    $label= sprintf('c%u', crc32($last));
     foreach ($catch[0] as $type) {
       $this->out->write('catch('.$type.' $'.$catch[1].') { goto '.$label.'; }');
     }

src/main/php/lang/ast/emit/PHP70.class.php

@@ -31,7 +31,7 @@ protected function returnType($name) {
 
   protected function catches($catch) {
     $last= array_pop($catch[0]);
-    $label= 'c'.crc32($last);
+    $label= sprintf('c%u', crc32($last));
     foreach ($catch[0] as $type) {
       $this->out->write('catch('.$type.' $'.$catch[1].') { goto '.$label.'; }');
     }

src/test/php/lang/ast/unittest/emit/EmittingTest.class.php

@@ -30,7 +30,7 @@ protected function type($code) {
     $out= new MemoryOutputStream();
     $emit= Emitter::forRuntime(PHP_VERSION)->newInstance(new StringWriter($out));
     $emit->emit($parse->execute());
-
+    // var_dump($out->getBytes());
     self::$cl->setClassBytes($name, $out->getBytes());
     return self::$cl->loadClass($name);
   }