KeyedLoadIC should have same register spec as LoadIC.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 1709 matching lines @@
   __ SetStackPointer(csp);
   __ PopCalleeSavedRegisters();
   // After this point, we must not modify jssp because it is a callee-saved
   // register which we have just restored.
   __ Ret();
 }
 
 
 void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
   Label miss;
-  Register receiver;
+  Register receiver = LoadIC::ReceiverRegister();
+  Register name = LoadIC::NameRegister();
+
+  ASSERT(kind() == Code::LOAD_IC ||
+         kind() == Code::KEYED_LOAD_IC);
+
   if (kind() == Code::KEYED_LOAD_IC) {
-    // ----------- S t a t e -------------
-    //  -- lr    : return address
-    //  -- x1    : receiver
-    //  -- x0    : key
-    // -----------------------------------
-    Register key = x0;
-    receiver = x1;
-    __ Cmp(key, Operand(isolate()->factory()->prototype_string()));
+    __ Cmp(name, Operand(isolate()->factory()->prototype_string()));
     __ B(ne, &miss);
-  } else {
-    ASSERT(kind() == Code::LOAD_IC);
-    // ----------- S t a t e -------------
-    //  -- lr    : return address
-    //  -- x2    : name
-    //  -- x0    : receiver
-    //  -- sp[0] : receiver
-    // -----------------------------------
-    receiver = x0;
   }
 
   StubCompiler::GenerateLoadFunctionPrototype(masm, receiver, x10, x11, &miss);
 
   __ Bind(&miss);
   StubCompiler::TailCallBuiltin(masm,
                                 BaseLoadStoreStubCompiler::MissBuiltin(kind()));
 }
 
 
@@ skipping 3679 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64