MIPS: Use a register spec for StoreIC and KeyedStoreIC.

src/mips/stub-cache-mips.cc

Index: src/mips/stub-cache-mips.cc
diff --git a/src/mips/stub-cache-mips.cc b/src/mips/stub-cache-mips.cc
index 3611a28c1ba8134664d595f1672461d3467f3a3a..d08d597b9e7c0990c8669b59cf7370e4e96cc22d 100644
--- a/src/mips/stub-cache-mips.cc
+++ b/src/mips/stub-cache-mips.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, t0, t1 };
+  Register receiver = StoreIC::ReceiverRegister();
+  Register name = StoreIC::NameRegister();
+  static Register registers[] = { receiver, name, a3, t0, t1 };
   return registers;
 }
 
 
 Register* KeyedStoreStubCompiler::registers() {
   // receiver, name, scratch1, scratch2, scratch3.
-  static Register registers[] = { a2, a1, a3, t0, t1 };
+  Register receiver = KeyedStoreIC::ReceiverRegister();
+  Register name = KeyedStoreIC::NameRegister();
+  static Register registers[] = { receiver, name, a3, t0, t1 };
   return registers;
 }