Fix performance regression on Tracer: recognize _doublePow in Math.

runtime/vm/intermediate_language_arm.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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 4122 matching lines @@
     result->set_in(1, Location::FpuRegisterLocation(Q1));
   }
   result->set_out(Location::FpuRegisterLocation(Q0));
   return result;
 }
 
 
 void InvokeMathCFunctionInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // For pow-function return NaN if exponent is NaN.
   Label do_call, skip_call;
-  if (recognized_kind() == MethodRecognizer::kDoublePow) {
+  if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     DRegister exp = EvenDRegisterOf(locs()->in(1).fpu_reg());
     DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
     __ vcmpd(exp, exp);
     __ vmstat();
     __ b(&do_call, VC);  // NaN -> false;
     // Exponent is NaN, return NaN.
     __ vmovd(result, exp);
     __ b(&skip_call);
   }
   __ Bind(&do_call);
@@ skipping 489 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM