MIPS: Repeat last debugger command in the arm simulator when command input is empty.

src/mips/simulator-mips.h

Index: src/mips/simulator-mips.h
diff --git a/src/mips/simulator-mips.h b/src/mips/simulator-mips.h
index 69dddfad3a7d41fc3c45361f5dcec4683fad6ea0..ba625f45babbd98262b43237c1d8cee3afa2875f 100644
--- a/src/mips/simulator-mips.h
+++ b/src/mips/simulator-mips.h
@@ -221,6 +221,10 @@ class Simulator {
   // Pop an address from the JS stack.
   uintptr_t PopAddress();
 
+  // Debugger input.
+  void set_last_debugger_input(char* input);
+  char* last_debugger_input() { return last_debugger_input_; }
+
   // ICache checking.
   static void FlushICache(v8::internal::HashMap* i_cache, void* start,
                           size_t size);
@@ -358,6 +362,9 @@ class Simulator {
   int icount_;
   int break_count_;
 
+  // Debugger input.
+  char* last_debugger_input_;
+
   // Icache simulation.
   v8::internal::HashMap* i_cache_;