MIPS: Minor fixes and additions needed for Turbofan.

src/mips/deoptimizer-mips.cc

Index: src/mips/deoptimizer-mips.cc
diff --git a/src/mips/deoptimizer-mips.cc b/src/mips/deoptimizer-mips.cc
index dd9832d56c4ced7b971cba8357a3db9b902ffc4c..b40d7f45ff92e300a9e6cb15e2a94124f00d9ac6 100644
--- a/src/mips/deoptimizer-mips.cc
+++ b/src/mips/deoptimizer-mips.cc
@@ -102,9 +102,8 @@ void Deoptimizer::SetPlatformCompiledStubRegisters(
   ExternalReference xref(&function, ExternalReference::BUILTIN_CALL, isolate_);
   intptr_t handler = reinterpret_cast<intptr_t>(xref.address());
   int params = descriptor->GetHandlerParameterCount();
-  output_frame->SetRegister(s0.code(), params);
-  output_frame->SetRegister(s1.code(), (params - 1) * kPointerSize);
-  output_frame->SetRegister(s2.code(), handler);
+  output_frame->SetRegister(a0.code(), params);
+  output_frame->SetRegister(a1.code(), handler);
 }