[turbofan] Eliminate typed array bounds checks if both key and length are constant.

src/compiler/simplified-operator-reducer.h

Index: src/compiler/simplified-operator-reducer.h
diff --git a/src/compiler/simplified-operator-reducer.h b/src/compiler/simplified-operator-reducer.h
index 32f49adc56e79b922ca6182ca38f47fe488ece63..88e9311e530429134405398a1d81e2b949dac805 100644
--- a/src/compiler/simplified-operator-reducer.h
+++ b/src/compiler/simplified-operator-reducer.h
@@ -6,6 +6,7 @@
 #define V8_COMPILER_SIMPLIFIED_OPERATOR_REDUCER_H_
 
 #include "src/compiler/graph-reducer.h"
+#include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
@@ -21,7 +22,7 @@ class MachineOperatorBuilder;
 
 class SimplifiedOperatorReducer FINAL : public Reducer {
  public:
-  explicit SimplifiedOperatorReducer(JSGraph* jsgraph) : jsgraph_(jsgraph) {}
+  explicit SimplifiedOperatorReducer(JSGraph* jsgraph);
   virtual ~SimplifiedOperatorReducer();
 
   virtual Reduction Reduce(Node* node) OVERRIDE;
@@ -40,8 +41,10 @@ class SimplifiedOperatorReducer FINAL : public Reducer {
   Factory* factory() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   MachineOperatorBuilder* machine() const;
+  SimplifiedOperatorBuilder* simplified() { return &simplified_; }
 
   JSGraph* jsgraph_;
+  SimplifiedOperatorBuilder simplified_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorReducer);
 };