MIPS: Use allocatable registers for Interpreter.

src/compiler/mips64/linkage-mips64.cc

Index: src/compiler/mips64/linkage-mips64.cc
diff --git a/src/compiler/mips64/linkage-mips64.cc b/src/compiler/mips64/linkage-mips64.cc
index ccdb11d55014ae2efee20de0beb7ec4f78a1e645..ee1a6031d8208eefe2bf9b0802b6941399ae77b7 100644
--- a/src/compiler/mips64/linkage-mips64.cc
+++ b/src/compiler/mips64/linkage-mips64.cc
@@ -17,8 +17,8 @@ struct MipsLinkageHelperTraits {
   static Register ReturnValue2Reg() { return v1; }
   static Register JSCallFunctionReg() { return a1; }
   static Register ContextReg() { return cp; }
-  static Register InterpreterBytecodePointerReg() { return s0; }
-  static Register InterpreterDispatchTableReg() { return s1; }
+  static Register InterpreterBytecodePointerReg() { return t1; }
+  static Register InterpreterDispatchTableReg() { return t2; }
   static Register RuntimeCallFunctionReg() { return a1; }
   static Register RuntimeCallArgCountReg() { return a0; }
   static RegList CCalleeSaveRegisters() {