[builtins] Introduce proper Float64Log2 and Float64Log10 operators.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 274636d762cd8c6f4cbeb24d8b08ac3a705ebc79..7b9b8e1e1a2e1ef3c9a8e5c84038bf0d815c80d2 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -1142,6 +1142,10 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsFloat64(node), VisitFloat64Log(node);
     case IrOpcode::kFloat64Log1p:
       return MarkAsFloat64(node), VisitFloat64Log1p(node);
+    case IrOpcode::kFloat64Log2:
+      return MarkAsFloat64(node), VisitFloat64Log2(node);
+    case IrOpcode::kFloat64Log10:
+      return MarkAsFloat64(node), VisitFloat64Log10(node);
     case IrOpcode::kFloat64Sqrt:
       return MarkAsFloat64(node), VisitFloat64Sqrt(node);
     case IrOpcode::kFloat64Equal:
@@ -1263,6 +1267,14 @@ void InstructionSelector::VisitFloat64Log1p(Node* node) {
   VisitFloat64Ieee754Unop(node, kIeee754Float64Log1p);
 }
 
+void InstructionSelector::VisitFloat64Log2(Node* node) {
+  VisitFloat64Ieee754Unop(node, kIeee754Float64Log2);
+}
+
+void InstructionSelector::VisitFloat64Log10(Node* node) {
+  VisitFloat64Ieee754Unop(node, kIeee754Float64Log10);
+}
+
 void InstructionSelector::EmitTableSwitch(const SwitchInfo& sw,
                                           InstructionOperand& index_operand) {
   OperandGenerator g(this);