Remove dead code from InvokeDartCode stub.

runtime/vm/stub_code_mips.cc

Index: runtime/vm/stub_code_mips.cc
===================================================================
--- runtime/vm/stub_code_mips.cc	(revision 41310)
+++ runtime/vm/stub_code_mips.cc	(working copy)
@@ -870,8 +870,6 @@
 
   // The new context, saved vm tag, the top exit frame, and the old context.
   const intptr_t kPreservedContextSlots = 4;
-  const intptr_t kNewContextOffsetFromFp =
-      -(1 + kAbiPreservedCpuRegCount + kAbiPreservedFpuRegCount) * kWordSize;
   const intptr_t kPreservedRegSpace =
       kWordSize * (kAbiPreservedCpuRegCount + kAbiPreservedFpuRegCount +
                    kPreservedContextSlots);
@@ -973,14 +971,10 @@
   __ jalr(A0);  // S4 is the arguments descriptor array.
   __ TraceSimMsg("InvokeDartCodeStub return");
 
-  // Read the saved new Context pointer.
-  __ lw(CTX, Address(FP, kNewContextOffsetFromFp));
-  __ lw(CTX, Address(CTX, VMHandles::kOffsetOfRawPtrInHandle));
-
   // Get rid of arguments pushed on the stack.
   __ AddImmediate(SP, FP, kSavedContextSlotFromEntryFp * kWordSize);
 
-  // Load Isolate pointer into CTX. Drop Context.
+  // Load Isolate pointer into CTX.
   __ LoadIsolate(CTX);
 
   // Restore the current VMTag from the stack.