[fullcodegen] Remove unused EmitPropertyKey method

R=bmeurer@chromium.org
BUG=v8:5657

Review-Url: https://codereview.chromium.org/2609863006
Cr-Commit-Position: refs/heads/master@{#42096}

src/full-codegen/full-codegen.cc

@@ -1060,14 +1060,6 @@ void FullCodeGenerator::EmitKeyedPropertyLoad(Property* prop) {
   RestoreContext();
 }
 
-void FullCodeGenerator::EmitPropertyKey(LiteralProperty* property,
-                                        BailoutId bailout_id) {
-  VisitForStackValue(property->key());
-  CallRuntimeWithOperands(Runtime::kToName);
-  PrepareForBailoutForId(bailout_id, BailoutState::TOS_REGISTER);
-  PushOperand(result_register());
-}
-
 void FullCodeGenerator::EmitLoadSlot(Register destination,
                                      FeedbackVectorSlot slot) {
   DCHECK(!slot.IsInvalid());

src/full-codegen/full-codegen.h

@@ -456,9 +456,6 @@ class FullCodeGenerator final : public AstVisitor<FullCodeGenerator> {
   // The receiver and the key is left on the stack by the IC.
   void EmitKeyedPropertyLoad(Property* expr);
 
-  // Pushes the property key as a Name on the stack.
-  void EmitPropertyKey(LiteralProperty* property, BailoutId bailout_id);
-
   // Apply the compound assignment operator. Expects the left operand on top
   // of the stack and the right one in the accumulator.
   void EmitBinaryOp(BinaryOperation* expr, Token::Value op);