[wasm] Use the new Float64Pow TF operator to implement F64Pow.

R=bmeurer@chromium.org

BUG=v8:5086,v8:5157

Review-Url: https://codereview.chromium.org/2107733002
Cr-Commit-Position: refs/heads/master@{#37375}

src/assembler.cc

@@ -1259,16 +1259,6 @@ ExternalReference ExternalReference::f64_asin_wrapper_function(
   return ExternalReference(Redirect(isolate, FUNCTION_ADDR(f64_asin_wrapper)));
 }
 
-static void f64_pow_wrapper(double* param0, double* param1) {
-  WriteDoubleValue(param0, power_double_double(ReadDoubleValue(param0),
-                                               ReadDoubleValue(param1)));
-}
-
-ExternalReference ExternalReference::f64_pow_wrapper_function(
-    Isolate* isolate) {
-  return ExternalReference(Redirect(isolate, FUNCTION_ADDR(f64_pow_wrapper)));
-}
-
 static void f64_mod_wrapper(double* param0, double* param1) {
   WriteDoubleValue(param0,
                    modulo(ReadDoubleValue(param0), ReadDoubleValue(param1)));

src/assembler.h

@@ -973,7 +973,6 @@ class ExternalReference BASE_EMBEDDED {
 
   static ExternalReference f64_acos_wrapper_function(Isolate* isolate);
   static ExternalReference f64_asin_wrapper_function(Isolate* isolate);
-  static ExternalReference f64_pow_wrapper_function(Isolate* isolate);
   static ExternalReference f64_mod_wrapper_function(Isolate* isolate);
 
   // Log support.

src/compiler/wasm-compiler.cc

@@ -604,7 +604,8 @@ Node* WasmGraphBuilder::Binop(wasm::WasmOpcode opcode, Node* left, Node* right,
     case wasm::kExprF64Max:
       return BuildF64Max(left, right);
     case wasm::kExprF64Pow:
-      return BuildF64Pow(left, right);
+      op = m->Float64Pow();
+      break;
     case wasm::kExprF64Atan2:
       op = m->Float64Atan2();
       break;
@@ -1482,13 +1483,6 @@ Node* WasmGraphBuilder::BuildF64Asin(Node* input) {
   return BuildCFuncInstruction(ref, type, input);
 }
 
-Node* WasmGraphBuilder::BuildF64Pow(Node* left, Node* right) {
-  MachineType type = MachineType::Float64();
-  ExternalReference ref =
-      ExternalReference::f64_pow_wrapper_function(jsgraph()->isolate());
-  return BuildCFuncInstruction(ref, type, left, right);
-}
-
 Node* WasmGraphBuilder::BuildF64Mod(Node* left, Node* right) {
   MachineType type = MachineType::Float64();
   ExternalReference ref =

src/compiler/wasm-compiler.h

@@ -280,7 +280,6 @@ class WasmGraphBuilder {
 
   Node* BuildF64Acos(Node* input);
   Node* BuildF64Asin(Node* input);
-  Node* BuildF64Pow(Node* left, Node* right);
   Node* BuildF64Mod(Node* left, Node* right);
 
   Node* BuildIntToFloatConversionInstruction(

src/external-reference-table.cc

@@ -170,8 +170,6 @@ ExternalReferenceTable::ExternalReferenceTable(Isolate* isolate) {
       "f64_acos_wrapper");
   Add(ExternalReference::f64_asin_wrapper_function(isolate).address(),
       "f64_asin_wrapper");
-  Add(ExternalReference::f64_pow_wrapper_function(isolate).address(),
-      "f64_pow_wrapper");
   Add(ExternalReference::f64_mod_wrapper_function(isolate).address(),
       "f64_mod_wrapper");
   Add(ExternalReference::log_enter_external_function(isolate).address(),