[turbofan] Add checked load/store operators.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index 3dfcefdfc4fab248a91c763f8aeb457bdfbb8f72..8c9936287c887359e9cfad7022795937821f370d 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -19,9 +19,9 @@ namespace compiler {
 class JSTypedLowering FINAL : public Reducer {
  public:
   explicit JSTypedLowering(JSGraph* jsgraph);
-  virtual ~JSTypedLowering();
+  ~JSTypedLowering() {}
 
-  virtual Reduction Reduce(Node* node) OVERRIDE;
+  Reduction Reduce(Node* node) OVERRIDE;
 
   JSGraph* jsgraph() { return jsgraph_; }
   Graph* graph() { return jsgraph_->graph(); }
@@ -51,6 +51,8 @@ class JSTypedLowering FINAL : public Reducer {
   Reduction ReduceI32Shift(Node* node, bool left_signed,
                            const Operator* shift_op);
 
+  Node* Word32Shl(Node* const lhs, int32_t const rhs);
+
   JSOperatorBuilder* javascript() { return jsgraph_->javascript(); }
   CommonOperatorBuilder* common() { return jsgraph_->common(); }
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
@@ -61,6 +63,7 @@ class JSTypedLowering FINAL : public Reducer {
   Type* zero_range_;
   Type* one_range_;
   Type* zero_thirtyone_range_;
+  Type* shifted_int32_ranges_[4];
 };
 
 }  // namespace compiler