Optimizing HandleScope. Also fixed HandleScope destruction when API getter th...

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
===================================================================
--- src/x64/stub-cache-x64.cc	(revision 5685)
+++ src/x64/stub-cache-x64.cc	(working copy)
@@ -2543,7 +2543,6 @@
   Handle<AccessorInfo> callback_handle(callback);
 
   __ EnterInternalFrame();
-  __ PushHandleScope(scratch2);
   // Push the stack address where the list of arguments ends.
   __ movq(scratch2, rsp);
   __ subq(scratch2, Immediate(2 * kPointerSize));
@@ -2597,17 +2596,6 @@
   // Discard allocated slot.
   __ addq(rsp, Immediate(kPointerSize));
 #endif
-
-  // We need to avoid using rax since that now holds the result.
-  Register tmp = scratch2.is(rax) ? reg : scratch2;
-  // Emitting PopHandleScope may try to allocate.  Do not allow the
-  // assembler to perform a garbage collection but instead return a
-  // failure object.
-  result = masm()->TryPopHandleScope(rax, tmp);
-  if (result->IsFailure()) {
-    *failure = Failure::cast(result);
-    return false;
-  }
   __ LeaveInternalFrame();
 
   __ ret(0);