Remove MIPS support

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 700 matching lines @@
   if (optimized() && !function.IsOptimizable()) {
     return Code::null();
   }
   Zone* const zone = thread()->zone();
   NOT_IN_PRODUCT(TimelineStream* compiler_timeline =
                      Timeline::GetCompilerStream());
   CSTAT_TIMER_SCOPE(thread(), codegen_timer);
   HANDLESCOPE(thread());
 
   // We may reattempt compilation if the function needs to be assembled using
-  // far branches on ARM and MIPS. In the else branch of the setjmp call,
-  // done is set to false, and use_far_branches is set to true if there is a
-  // longjmp from the ARM or MIPS assemblers. In all other paths through this
-  // while loop, done is set to true. use_far_branches is always false on ia32
-  // and x64.
+  // far branches on ARM. In the else branch of the setjmp call, done is set to
+  // false, and use_far_branches is set to true if there is a longjmp from the
+  // ARM assembler. In all other paths through this while loop, done is set to
+  // true. use_far_branches is always false on ia32 and x64.
   volatile bool done = false;
   // volatile because the variable may be clobbered by a longjmp.
   volatile bool use_far_branches = false;
   const bool use_speculative_inlining = false;
 
   Code* volatile result = &Code::ZoneHandle(zone);
   while (!done) {
     *result = Code::null();
     const intptr_t prev_deopt_id = thread()->deopt_id();
     thread()->set_deopt_id(0);
@@ skipping 1598 matching lines @@
 
 
 bool BackgroundCompiler::IsDisabled() {
   UNREACHABLE();
   return true;
 }
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart