Remove HFixedArrayBaseLength instruction and replace with regular HLoadNamedField.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index ed6ab15c6f695019f1313011095a9807371a26d3..36ff637faaa952771213f36afa5ece3103be9da8 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -111,7 +111,6 @@ class LChunkBuilder;
   V(ElementsKind)                              \
   V(EnterInlined)                              \
   V(EnvironmentMarker)                         \
-  V(FixedArrayBaseLength)                      \
   V(ForceRepresentation)                       \
   V(FunctionLiteral)                           \
   V(GetCachedArrayIndex)                       \
@@ -2542,29 +2541,6 @@ class HCallRuntime: public HCall<1> {
 };
 
 
-class HFixedArrayBaseLength: public HUnaryOperation {
- public:
-  explicit HFixedArrayBaseLength(HValue* value) : HUnaryOperation(value) {
-    set_type(HType::Smi());
-    set_representation(Representation::Smi());
-    SetFlag(kUseGVN);
-    SetGVNFlag(kDependsOnArrayLengths);
-  }
-
-  virtual Representation RequiredInputRepresentation(int index) {
-    return Representation::Tagged();
-  }
-
-  DECLARE_CONCRETE_INSTRUCTION(FixedArrayBaseLength)
-
- protected:
-  virtual bool DataEquals(HValue* other) { return true; }
-
- private:
-  virtual bool IsDeletable() const { return true; }
-};
-
-
 class HMapEnumLength: public HUnaryOperation {
  public:
   explicit HMapEnumLength(HValue* value) : HUnaryOperation(value) {