[turbofan] Introduce Float64Pow and NumberPow operators.

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 2ae1fc909e55ac72c5eea5f4ec09950c005f6443..b42694c2cac642fbad717137530fdc379425c76b 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -900,6 +900,14 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kIeee754Float64Log10:
       ASSEMBLE_IEEE754_UNOP(log10);
       break;
+    case kIeee754Float64Pow: {
+      // TODO(bmeurer): Improve integration of the stub.
+      __ Movsd(xmm2, xmm0);
+      MathPowStub stub(isolate(), MathPowStub::DOUBLE);
+      __ CallStub(&stub);
+      __ Movsd(xmm0, xmm3);
+      break;
+    }
     case kIeee754Float64Sin:
       ASSEMBLE_IEEE754_UNOP(sin);
       break;