[cleanup] Drop unused scratch register from {load,store}_calling_convention

src/ic/x64/access-compiler-x64.cc

Index: src/ic/x64/access-compiler-x64.cc
diff --git a/src/ic/x64/access-compiler-x64.cc b/src/ic/x64/access-compiler-x64.cc
index b8d50b3d2cdbdc12f116f398ca80f30d52a0bf0f..2b292528c8c7cd80eadc881668e6cb11f51e2276 100644
--- a/src/ic/x64/access-compiler-x64.cc
+++ b/src/ic/x64/access-compiler-x64.cc
@@ -19,19 +19,19 @@ void PropertyAccessCompiler::GenerateTailCall(MacroAssembler* masm,
 
 
 Register* PropertyAccessCompiler::load_calling_convention() {
-  // receiver, name, scratch1, scratch2, scratch3, scratch4.
+  // receiver, name, scratch1, scratch2, scratch3.
   Register receiver = LoadDescriptor::ReceiverRegister();
   Register name = LoadDescriptor::NameRegister();
-  static Register registers[] = {receiver, name, rax, rbx, rdi, r8};
+  static Register registers[] = {receiver, name, rax, rbx, rdi};
   return registers;
 }
 
 
 Register* PropertyAccessCompiler::store_calling_convention() {
-  // receiver, name, scratch1, scratch2, scratch3.
+  // receiver, name, scratch1, scratch2.
   Register receiver = StoreDescriptor::ReceiverRegister();
   Register name = StoreDescriptor::NameRegister();
-  static Register registers[] = {receiver, name, rbx, rdi, r8};
+  static Register registers[] = {receiver, name, rbx, rdi};
   return registers;
 }