Hide VM-only coreimpl List implementation types. These should not be

runtime/vm/intrinsifier_ia32.cc

Index: runtime/vm/intrinsifier_ia32.cc
diff --git a/runtime/vm/intrinsifier_ia32.cc b/runtime/vm/intrinsifier_ia32.cc
index 8bc661e7b89836c0735ccef516aa2c8e879db236..80f6a6d6367a71f2ee833b78b71ef18f468c2e4c 100644
--- a/runtime/vm/intrinsifier_ia32.cc
+++ b/runtime/vm/intrinsifier_ia32.cc
@@ -174,7 +174,7 @@ bool Intrinsifier::ImmutableArray_getIndexed(Assembler* assembler) {
 
 
 static intptr_t ComputeObjectArrayTypeArgumentsOffset() {
-  const String& class_name = String::Handle(Symbols::New("ObjectArray"));
+  const String& class_name = String::Handle(Symbols::New("_ObjectArray"));
   const Class& cls = Class::Handle(
       Library::Handle(Library::CoreImplLibrary()).LookupClass(class_name));
   ASSERT(!cls.IsNull());
@@ -1290,7 +1290,7 @@ bool Intrinsifier::Object_equal(Assembler* assembler) {
 }
 
 
-static const char* kFixedSizeArrayIteratorClassName = "FixedSizeArrayIterator";
+static const char* kFixedSizeArrayIteratorClassName = "_FixedSizeArrayIterator";
 
 
 // Class 'FixedSizeArrayIterator':