Unbreak IA32 generated code coverage.

src/ia32/jump-target-ia32.cc

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 97 matching lines @@
     // around the merge code on the fall through path.
     Label original_fall_through;
     __ j(NegateCondition(cc), &original_fall_through, NegateHint(hint));
     cgen_->frame()->MergeTo(entry_frame_);
     cgen_->DeleteFrame();
     __ jmp(&entry_label_);
     cgen_->SetFrame(fall_through_frame, &non_frame_registers);
     __ bind(&original_fall_through);
 
   } else {
-    // Forward branch.  A copy of the current frame is added to the end
-    // of the list of frames reaching the target block and a branch to
-    // the merge code is emitted.
+    // Forward branch.  A copy of the current frame is added to the end of the
+    // list of frames reaching the target block and a branch to the merge code
+    // is emitted.  Use masm_-> instead of __ as forward branches are expected
+    // to be a fixed size (no inserted coverage-checking instructions please).
+    // This is used in Reference::GetValue.
     AddReachingFrame(new VirtualFrame(cgen_->frame()));
-    __ j(cc, &merge_labels_.last(), hint);
+    masm_->j(cc, &merge_labels_.last(), hint);
     is_linked_ = true;
   }
 }
 
 
 void JumpTarget::Call() {
   // Call is used to push the address of the catch block on the stack as
   // a return address when compiling try/catch and try/finally.  We
   // fully spill the frame before making the call.  The expected frame
   // at the label (which should be the only one) is the spilled current
@@ skipping 193 matching lines @@
   }
 
   is_linked_ = false;
   is_bound_ = true;
 }
 
 #undef __
 
 
 } }  // namespace v8::internal