Remove isolate pointer from context objects.

runtime/vm/intermediate_language_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.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 2429 matching lines @@
 
   __ TryAllocateArray(kContextCid, instance_size, slow_path->entry_label(),
                       Assembler::kFarJump,
                       result,  // instance
                       temp);  // end address
 
   // Setup up number of context variables field.
   __ movl(FieldAddress(result, Context::num_variables_offset()),
           Immediate(num_context_variables()));
 
-  // Setup isolate field.
-  __ movl(FieldAddress(result, Context::isolate_offset()),
-          Immediate(reinterpret_cast<int32_t>(Isolate::Current())));
-
   __ Bind(slow_path->exit_label());
 }
 
 
 LocationSummary* AllocateContextInstr::MakeLocationSummary(Isolate* isolate,
                                                            bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 1;
   LocationSummary* locs = new(isolate) LocationSummary(
       isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
@@ skipping 4305 matching lines @@
   __ movl(EDX, Immediate(kInvalidObjectPointer));
   __ movl(EDX, Immediate(kInvalidObjectPointer));
 #endif
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32