Adding TruffleBoundary to ZipImporter

Author: ppisl

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/zipimporter/PZipImporter.java

@@ -120,6 +120,7 @@ public PZipImporter(LazyPythonClass cls, PDict zipDirectoryCache) {
         }
     }
 
+    @CompilerDirectives.TruffleBoundary
     private static SearchOrderEntry[] defineSearchOrder() {
         return new SearchOrderEntry[]{
                         new SearchOrderEntry(SEPARATOR + "__init__.py",

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/zipimporter/ZipImporterBuiltins.java

@@ -84,12 +84,6 @@ protected List<? extends NodeFactory<? extends PythonBuiltinBaseNode>> getNodeFa
         return ZipImporterBuiltinsFactory.getFactories();
     }
 
-    private static void checkInitCalled(PZipImporter self) {
-        if (self.getPrefix() == null) {
-
-        }
-    }
-
     @Builtin(name = __INIT__, fixedNumOfPositionalArgs = 1)
     @TypeSystemReference(PythonArithmeticTypes.class)
     @GenerateNodeFactory