Implement long jump in ARM and MIPS simulators.

runtime/vm/simulator_mips.h

Index: runtime/vm/simulator_mips.h
===================================================================
--- runtime/vm/simulator_mips.h	(revision 21676)
+++ runtime/vm/simulator_mips.h	(working copy)
@@ -17,6 +17,7 @@
 #endif
 
 #include "vm/constants_mips.h"
+#include "vm/object.h"
 
 namespace dart {
 
@@ -89,6 +90,12 @@
   };
   static uword RedirectExternalReference(uword function, CallKind call_kind);
 
+  void Longjmp(uword pc,
+               uword sp,
+               uword fp,
+               RawObject* raw_exception,
+               RawObject* raw_stacktrace);
+
  private:
   // A pc value used to signal the simulator to stop execution.  Generally
   // the ra is set to this value on transition from native C code to
@@ -171,6 +178,7 @@
 
   friend class SimulatorDebugger;
   friend class SimulatorSetjmpBuffer;
+  DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart