Replace HCheckPrototypeMaps by explicit map checks of constant values.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index b5d01c8fa8defc08d1d4b9caad46e6b6957dafbd..73bd7c28823dd081aceb3a0607876c7d48cb40fc 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -68,7 +68,6 @@ class LCodeGen;
   V(CheckMaps)                                  \
   V(CheckMapValue)                              \
   V(CheckNonSmi)                                \
-  V(CheckPrototypeMaps)                         \
   V(CheckSmi)                                   \
   V(ClampDToUint8)                              \
   V(ClampIToUint8)                              \
@@ -2276,24 +2275,6 @@ class LCheckMaps: public LTemplateInstruction<0, 1, 0> {
 };
 
 
-class LCheckPrototypeMaps: public LTemplateInstruction<0, 0, 1> {
- public:
-  explicit LCheckPrototypeMaps(LOperand* temp)  {
-    temps_[0] = temp;
-  }
-
-  LOperand* temp() { return temps_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(CheckPrototypeMaps, "check-prototype-maps")
-  DECLARE_HYDROGEN_ACCESSOR(CheckPrototypeMaps)
-
-  ZoneList<Handle<JSObject> >* prototypes() const {
-    return hydrogen()->prototypes();
-  }
-  ZoneList<Handle<Map> >* maps() const { return hydrogen()->maps(); }
-};
-
-
 class LCheckSmi: public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LCheckSmi(LOperand* value) {