Fix 'step in' after live edit stack manipulation

src/mips/debug-mips.cc

Index: src/mips/debug-mips.cc
diff --git a/src/mips/debug-mips.cc b/src/mips/debug-mips.cc
index 8c40930c59d740c7e757bb3021ee85b767e8b235..47961fac7e29b8cdbf684fc9cecc7cb9610122fa 100644
--- a/src/mips/debug-mips.cc
+++ b/src/mips/debug-mips.cc
@@ -117,9 +117,10 @@ void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
 #undef __
 
 
-void Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
-                                   Handle<Code> code) {
+Object** Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
+                                       Handle<Code> code) {
   UNREACHABLE();
+  return NULL;
 }
 const int Debug::kFrameDropperFrameSize = -1;