X87: Remove code object from StackHandler.

port e0aa8ebf (r27103).

original commit message:

  This reduces the size of the StackHandler by one word. We no longer
  need to keep track of the code object, as the stack walk finds it.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/1022403002

Cr-Commit-Position: refs/heads/master@{#27353}

src/x87/macro-assembler-x87.cc

@@ -990,12 +990,11 @@ void MacroAssembler::LeaveApiExitFrame(bool restore_context) {
 void MacroAssembler::PushTryHandler(StackHandler::Kind kind,
                                     int handler_index) {
   // Adjust this code if not the case.
-  STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
+  STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
-  STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
+  STATIC_ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize);
+  STATIC_ASSERT(StackHandlerConstants::kContextOffset == 2 * kPointerSize);
+  STATIC_ASSERT(StackHandlerConstants::kFPOffset == 3 * kPointerSize);
 
   // We will build up the handler from the bottom by pushing on the stack.
   // First push the frame pointer and context.
@@ -1009,12 +1008,11 @@ void MacroAssembler::PushTryHandler(StackHandler::Kind kind,
     push(ebp);
     push(esi);
   }
-  // Push the state and the code object.
+  // Push the state.
   unsigned state =
       StackHandler::IndexField::encode(handler_index) |
       StackHandler::KindField::encode(kind);
   push(Immediate(state));
-  Push(CodeObject());
 
   // Link the current handler as the next handler.
   ExternalReference handler_address(Isolate::kHandlerAddress, isolate());