PPC: [builtins] Migrate Math.log to TurboFan.

src/compiler/ppc/instruction-selector-ppc.cc

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index b8b9fd7bf0b920465bd28d5504cbb5f33954defa..01bfc9d916340d3c4cb76e1e80ec9290a5bed946 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -1310,6 +1310,11 @@ void InstructionSelector::VisitFloat64Abs(Node* node) {
   VisitRR(this, kPPC_AbsDouble, node);
 }
 
+void InstructionSelector::VisitFloat64Log(Node* node) {
+  PPCOperandGenerator g(this);
+  Emit(kPPC_LogDouble, g.DefineAsFixed(node, d1),
+       g.UseFixed(node->InputAt(0), d1))->MarkAsCall();
+}
 
 void InstructionSelector::VisitFloat32Sqrt(Node* node) {
   VisitRR(this, kPPC_SqrtDouble | MiscField::encode(1), node);