Fix lazy deopt after tagged binary ops

src/a64/lithium-a64.h

Index: src/a64/lithium-a64.h
diff --git a/src/a64/lithium-a64.h b/src/a64/lithium-a64.h
index 9550d2226a57109c2acf5375e439e7fe484a4d67..07f4bc4f3666a7890621ee0b6cd29df821f51d9b 100644
--- a/src/a64/lithium-a64.h
+++ b/src/a64/lithium-a64.h
@@ -2976,9 +2976,7 @@ class LChunkBuilder V8_FINAL : public LChunkBuilderBase {
         status_(UNUSED),
         current_instruction_(NULL),
         current_block_(NULL),
-        allocator_(allocator),
-        instruction_pending_deoptimization_environment_(NULL),
-        pending_deoptimization_ast_id_(BailoutId::None()) { }
+        allocator_(allocator) { }
 
   // Build the sequence for the graph.
   LPlatformChunk* Build();
@@ -3115,8 +3113,6 @@ class LChunkBuilder V8_FINAL : public LChunkBuilderBase {
   HInstruction* current_instruction_;
   HBasicBlock* current_block_;
   LAllocator* allocator_;
-  LInstruction* instruction_pending_deoptimization_environment_;
-  BailoutId pending_deoptimization_ast_id_;
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };