Port and integrate the irregexp engine from V8

runtime/vm/code_generator.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/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/bigint_operations.h"
 #include "vm/code_patcher.h"
@@ skipping 1013 matching lines @@
                                     original_function_name,
                                     orig_arguments,
                                     orig_arguments_desc));
   CheckResultError(result);
   arguments.SetReturn(result);
 }
 
 
 static bool CanOptimizeFunction(const Function& function, Isolate* isolate) {
   const intptr_t kLowInvocationCount = -100000000;
+  // TODO(jgruber): Enable optimizations of irregexp functions.
+  if (function.kind() == RawFunction::kIrregexpFunction) {
+    function.set_usage_counter(kLowInvocationCount);
+    return false;
+  }
   if (isolate->debugger()->IsStepping() ||
       isolate->debugger()->HasBreakpoint(function)) {
     // We cannot set breakpoints and single step in optimized code,
     // so do not optimize the function.
     function.set_usage_counter(0);
     return false;
   }
   if (function.deoptimization_counter() >=
       FLAG_deoptimization_counter_threshold) {
     if (FLAG_trace_failed_optimization_attempts ||
@@ skipping 538 matching lines @@
   field.RecordStore(value);
 }
 
 
 DEFINE_RUNTIME_ENTRY(InitStaticField, 1) {
   const Field& field = Field::CheckedHandle(arguments.ArgAt(0));
   field.EvaluateInitializer();
 }
 
 }  // namespace dart