Fix crash in debug builds introduced with r21110.

src/arm64/lithium-arm64.h

Index: src/arm64/lithium-arm64.h
diff --git a/src/arm64/lithium-arm64.h b/src/arm64/lithium-arm64.h
index 9422f9e306329010be36207d71bea3a1d203c60e..f5143ff52e81b1aef88a954db348a177ca83fa89 100644
--- a/src/arm64/lithium-arm64.h
+++ b/src/arm64/lithium-arm64.h
@@ -2502,7 +2502,6 @@ class LStoreNamedField V8_FINAL : public LTemplateInstruction<0, 2, 2> {
 
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
 
-  Handle<Map> transition() const { return hydrogen()->transition_map(); }
   Representation representation() const {
     return hydrogen()->field_representation();
   }
@@ -2999,9 +2998,6 @@ class LChunkBuilder V8_FINAL : public LChunkBuilderBase {
 
   void Abort(BailoutReason reason);
 
-  // Methods for code dependencies.
-  void AddDeprecationDependency(Handle<Map> map);
-
   // Methods for getting operands for Use / Define / Temp.
   LUnallocated* ToUnallocated(Register reg);
   LUnallocated* ToUnallocated(DoubleRegister reg);