MIPS: Use a register spec for StoreIC and KeyedStoreIC.

src/mips64/stub-cache-mips64.cc

Index: src/mips64/stub-cache-mips64.cc
diff --git a/src/mips64/stub-cache-mips64.cc b/src/mips64/stub-cache-mips64.cc
index 6c46321aae03a8cad7a22c5bd88b40345bee8767..26270496e4bec3dfc1c92d98a9014589d6febaa7 100644
--- a/src/mips64/stub-cache-mips64.cc
+++ b/src/mips64/stub-cache-mips64.cc
@@ -1270,20 +1270,24 @@ Register* KeyedLoadStubCompiler::registers() {
 
 
 Register StoreStubCompiler::value() {
-  return a0;
+  return StoreIC::ValueRegister();
 }
 
 
 Register* StoreStubCompiler::registers() {
   // receiver, name, scratch1, scratch2, scratch3.
-  static Register registers[] = { a1, a2, a3, a4, a5 };
+  Register receiver = StoreIC::ReceiverRegister();
+  Register name = StoreIC::NameRegister();
+  static Register registers[] = { receiver, name, a3, a4, a5 };
   return registers;
 }
 
 
 Register* KeyedStoreStubCompiler::registers() {
   // receiver, name, scratch1, scratch2, scratch3.
-  static Register registers[] = { a2, a1, a3, a4, a5 };
+  Register receiver = KeyedStoreIC::ReceiverRegister();
+  Register name = KeyedStoreIC::NameRegister();
+  static Register registers[] = { receiver, name, a3, a4, a5 };
   return registers;
 }