Use symbols when looking up fields in a class

runtime/vm/intrinsifier_ia32.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // The intrinsic code below is executed before a method has built its frame.
 // The return address is on the stack and the arguments below it.
 // Registers EDX (arguments descriptor) and ECX (function) must be preserved.
 // Each intrinsification method returns true if the corresponding
 // Dart method was intrinsified.
 
@@ skipping 1623 matching lines @@
 //    var state = ((_A * (_state[kSTATE_LO])) + _state[kSTATE_HI]) & _MASK_64;
 //    _state[kSTATE_LO] = state & _MASK_32;
 //    _state[kSTATE_HI] = state >> 32;
 void Intrinsifier::Random_nextState(Assembler* assembler) {
   const Library& math_lib = Library::Handle(Library::MathLibrary());
   ASSERT(!math_lib.IsNull());
   const Class& random_class = Class::Handle(
       math_lib.LookupClassAllowPrivate(Symbols::_Random()));
   ASSERT(!random_class.IsNull());
   const Field& state_field = Field::ZoneHandle(
-      random_class.LookupInstanceField(Symbols::_state()));
+      random_class.LookupInstanceFieldAllowPrivate(Symbols::_state()));
   ASSERT(!state_field.IsNull());
   const Field& random_A_field = Field::ZoneHandle(
-      random_class.LookupStaticField(Symbols::_A()));
+      random_class.LookupStaticFieldAllowPrivate(Symbols::_A()));
   ASSERT(!random_A_field.IsNull());
   ASSERT(random_A_field.is_const());
   const Instance& a_value = Instance::Handle(random_A_field.StaticValue());
   const int64_t a_int_value = Integer::Cast(a_value).AsInt64Value();
   // 'a_int_value' is a mask.
   ASSERT(Utils::IsUint(32, a_int_value));
   int32_t a_int32_value = static_cast<int32_t>(a_int_value);
   // Receiver.
   __ movl(EAX, Address(ESP, + 1 * kWordSize));
   // Field '_state'.
@@ skipping 503 matching lines @@
 void Intrinsifier::Profiler_getCurrentTag(Assembler* assembler) {
   __ LoadIsolate(EAX);
   __ movl(EAX, Address(EAX, Isolate::current_tag_offset()));
   __ ret();
 }
 
 #undef __
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32