Use IC register definitions in platform files.

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index b217815ea7cd04d1300213d294ce2ff03edcee7a..c287175ea2494eec24146a98075905380b9e2d4a 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -102,36 +102,6 @@ void RegExpConstructResultStub::InitializeInterfaceDescriptor(
 }
 
 
-void LoadFieldStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  // x0: receiver
-  Register registers[] = { x0 };
-  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-}
-
-
-void KeyedLoadFieldStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  // x1: receiver
-  Register registers[] = { x1 };
-  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-}
-
-
-void StringLengthStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { x0, x2 };
-  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-}
-
-
-void KeyedStringLengthStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { x1, x0 };
-  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-}
-
-
 void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
   // x2: receiver