Extend the InvokeRuntime() changes to mips64.

Change-Id: I3f825746053b9288ca31ab5e823d6a1648dfd894
diff --git a/compiler/optimizing/code_generator_mips64.h b/compiler/optimizing/code_generator_mips64.h
index 197f86b..3910530 100644
--- a/compiler/optimizing/code_generator_mips64.h
+++ b/compiler/optimizing/code_generator_mips64.h
@@ -323,12 +323,7 @@
   void InvokeRuntime(QuickEntrypointEnum entrypoint,
                      HInstruction* instruction,
                      uint32_t dex_pc,
-                     SlowPathCode* slow_path) OVERRIDE;
-
-  void InvokeRuntime(int32_t offset,
-                     HInstruction* instruction,
-                     uint32_t dex_pc,
-                     SlowPathCode* slow_path);
+                     SlowPathCode* slow_path = nullptr) OVERRIDE;
 
   ParallelMoveResolver* GetMoveResolver() OVERRIDE { return &move_resolver_; }