Remove MIPS support

runtime/vm/assembler_ia32.h

 // 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.
 
 #ifndef RUNTIME_VM_ASSEMBLER_IA32_H_
 #define RUNTIME_VM_ASSEMBLER_IA32_H_
 
 #ifndef RUNTIME_VM_ASSEMBLER_H_
 #error Do not include assembler_ia32.h directly; use assembler.h instead.
 #endif
@@ skipping 283 matching lines @@
 
 
 class Assembler : public ValueObject {
  public:
   explicit Assembler(bool use_far_branches = false)
       : buffer_(),
         prologue_offset_(-1),
         jit_cookie_(0),
         comments_(),
         code_(Code::ZoneHandle()) {
-    // This mode is only needed and implemented for MIPS and ARM.
+    // This mode is only needed and implemented for ARM.
     ASSERT(!use_far_branches);
   }
   ~Assembler() {}
 
   static const bool kNearJump = true;
   static const bool kFarJump = false;
 
   /*
    * Emit Machine Instructions.
    */
@@ skipping 692 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ASSEMBLER_IA32_H_