Faster invocation of custom comparator function.

src/ia32/virtual-frame-ia32.cc

Index: src/ia32/virtual-frame-ia32.cc
diff --git a/src/ia32/virtual-frame-ia32.cc b/src/ia32/virtual-frame-ia32.cc
index bc27e1de7a55804dcfa437f4cdc6ce3a5f4fbb95..10aaa52b8338055c3bc2ed4800ea6f3215d08c3d 100644
--- a/src/ia32/virtual-frame-ia32.cc
+++ b/src/ia32/virtual-frame-ia32.cc
@@ -909,6 +909,25 @@ Result VirtualFrame::CallStub(CodeStub* stub, Result* arg0, Result* arg1) {
 }
 
 
+Result VirtualFrame::CallJSFunction(int arg_count) {
+  Result function = Pop();
+
+  // InvokeFunction requires function in edi.  Move it in there.
+  function.ToRegister(edi);
+  function.Unuse();
+
+  // +1 for receiver.
+  PrepareForCall(arg_count + 1, arg_count + 1);
+  ASSERT(cgen()->HasValidEntryRegisters());
+  ParameterCount count(arg_count);
+  __ InvokeFunction(edi, count, CALL_FUNCTION);
+  RestoreContextRegister();
+  Result result = cgen()->allocator()->Allocate(eax);
+  ASSERT(result.is_valid());
+  return result;
+}
+
+
 Result VirtualFrame::CallRuntime(Runtime::Function* f, int arg_count) {
   PrepareForCall(arg_count, arg_count);
   ASSERT(cgen()->HasValidEntryRegisters());