Fix simulators.

runtime/vm/assembler_arm64.h

 // Copyright (c) 2014, 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.
 
 #ifndef VM_ASSEMBLER_ARM64_H_
 #define VM_ASSEMBLER_ARM64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm64.h directly; use assembler.h instead.
 #endif
@@ skipping 1534 matching lines @@
         op | size | s |
         (static_cast<int32_t>(rd) << kRdShift) |
         (static_cast<int32_t>(rn) << kRnShift) |
         o.encoding();
     Emit(encoding);
   }
 
   int32_t EncodeImm19BranchOffset(int64_t imm, int32_t instr) {
     if (!CanEncodeImm19BranchOffset(imm)) {
       ASSERT(!use_far_branches());
-      Isolate::Current()->long_jump_base()->Jump(
+      Thread::Current()->long_jump_base()->Jump(
           1, Object::branch_offset_error());
     }
     const int32_t imm32 = static_cast<int32_t>(imm);
     const int32_t off = (((imm32 >> 2) << kImm19Shift) & kImm19Mask);
     return (instr & ~kImm19Mask) | off;
   }
 
   int64_t DecodeImm19BranchOffset(int32_t instr) {
     const int32_t off = (((instr & kImm19Mask) >> kImm19Shift) << 13) >> 11;
     return static_cast<int64_t>(off);
@@ skipping 376 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM64_H_