MIPS: Simplify behavior of code stubs that accept a variable number of stack arguments in addition …

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 70dd60d6560cdb6a6938ff709130a72c0c00c101..03c64d9d2784282bbf763d3f5fb65501a4f2fc84 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -2421,7 +2421,7 @@ LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
     CodeStubInterfaceDescriptor* descriptor =
         info()->code_stub()->GetInterfaceDescriptor(info()->isolate());
     int index = static_cast<int>(instr->index());
-    Register reg = DESCRIPTOR_GET_PARAMETER_REGISTER(descriptor, index);
+    Register reg = descriptor->GetParameterRegister(index);
     return DefineFixed(result, reg);
   }
 }