[cleanup] Drop some dead code from Crankshaft.

This code was confusing, as it wasn't immediately obvious that this is
dead and doesn't need to updated anymore.

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2844993002
Cr-Commit-Position: refs/heads/master@{#44911}

src/crankshaft/hydrogen.h

@@ -1379,20 +1379,10 @@ class HGraphBuilder {
                                    ElementsKind kind,
                                    HValue* length);
 
-  void BuildTransitionElementsKind(HValue* object,
-                                   HValue* map,
-                                   ElementsKind from_kind,
-                                   ElementsKind to_kind,
-                                   bool is_jsarray);
-
   HValue* BuildNumberToString(HValue* object, AstType* type);
   HValue* BuildToNumber(HValue* input);
   HValue* BuildToObject(HValue* receiver);
 
-  HValue* BuildUncheckedDictionaryElementLoad(HValue* receiver,
-                                              HValue* elements, HValue* key,
-                                              HValue* hash);
-
   // ES6 section 7.4.7 CreateIterResultObject ( value, done )
   HValue* BuildCreateIterResultObject(HValue* value, HValue* done);
 
@@ -1475,8 +1465,6 @@ class HGraphBuilder {
                                       ElementsKind kind,
                                       HValue *dependency = NULL);
 
-  HValue* AddLoadJSBuiltin(int context_index);
-
   HValue* EnforceNumberType(HValue* number, AstType* expected);
   HValue* TruncateToNumber(HValue* value, AstType** expected);
 
@@ -1797,8 +1785,6 @@ class HGraphBuilder {
                          HValue* length,
                          HValue* capacity);
 
-  HValue* BuildElementIndexHash(HValue* index);
-
   void BuildCreateAllocationMemento(HValue* previous_object,
                                     HValue* previous_object_size,
                                     HValue* payload);
@@ -1809,14 +1795,8 @@ class HGraphBuilder {
                                         Handle<JSObject> holder,
                                         bool ensure_no_elements = false);
 
-  HInstruction* BuildGetNativeContext(HValue* closure);
   HInstruction* BuildGetNativeContext();
 
-  // Builds a loop version if |depth| is specified or unrolls the loop to
-  // |depth_value| iterations otherwise.
-  HValue* BuildGetParentContext(HValue* depth, int depth_value);
-
-  HInstruction* BuildGetArrayFunction();
   HValue* BuildArrayBufferViewFieldAccessor(HValue* object,
                                             HValue* checked_object,
                                             FieldIndex index);