[turbofan] Introduce Float64Pow and NumberPow operators.

src/crankshaft/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 12790 matching lines @@
   HValue* target = Pop();
   HValue* values[] = {context(), target,
                       Add<HConstant>(call->arguments()->length() - 2)};
   HInstruction* result =
       New<HCallWithDescriptor>(trampoline, call->arguments()->length() - 1,
                                descriptor, ArrayVector(values));
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-// Fast call to math functions.
-void HOptimizedGraphBuilder::GenerateMathPow(CallRuntime* call) {
-  DCHECK_EQ(2, call->arguments()->length());
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
-  HValue* right = Pop();
-  HValue* left = Pop();
-  HInstruction* result = NewUncasted<HPower>(left, right);
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
-
 void HOptimizedGraphBuilder::GenerateFixedArrayGet(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 2);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
   HValue* index = Pop();
   HValue* object = Pop();
   HInstruction* result = New<HLoadKeyed>(
       object, index, nullptr, nullptr, FAST_HOLEY_ELEMENTS, ALLOW_RETURN_HOLE);
   return ast_context()->ReturnInstruction(result, call->id());
 }
@@ skipping 852 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8