Fix performance regression on Tracer: recognize _doublePow in Math.

runtime/vm/intermediate_language_x64.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_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 4238 matching lines @@
   ASSERT(locs()->in(0).fpu_reg() == XMM1);
   __ EnterFrame(0);
   __ ReserveAlignedFrameSpace(0);
   __ movaps(XMM0, locs()->in(0).fpu_reg());
   if (InputCount() == 2) {
     ASSERT(locs()->in(1).fpu_reg() == XMM2);
     __ movaps(XMM1, locs()->in(1).fpu_reg());
   }
   // For pow-function return NaN if exponent is NaN.
   Label do_call, skip_call;
-  if (recognized_kind() == MethodRecognizer::kDoublePow) {
+  if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     XmmRegister exp = locs()->in(1).fpu_reg();
     __ comisd(exp, exp);
     __ j(PARITY_ODD, &do_call, Assembler::kNearJump);  // NaN -> false;
     // Exponent is NaN, return NaN.
     __ movaps(locs()->out().fpu_reg(), exp);
     __ jmp(&skip_call, Assembler::kNearJump);
   }
   __ Bind(&do_call);
   __ CallRuntime(TargetFunction());
   __ movaps(locs()->out().fpu_reg(), XMM0);
@@ skipping 525 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64