Add asserts and state tracking to ensure that we do not call

src/arm/debug-arm.cc

Index: src/arm/debug-arm.cc
===================================================================
--- src/arm/debug-arm.cc	(revision 8110)
+++ src/arm/debug-arm.cc	(working copy)
@@ -132,7 +132,8 @@
 static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
                                           RegList object_regs,
                                           RegList non_object_regs) {
-  __ EnterInternalFrame();
+{
+  FrameScope scope(masm, StackFrame::INTERNAL);
 
   // Store the registers containing live values on the expression stack to
   // make sure that these are correctly updated during GC. Non object values
@@ -180,7 +181,8 @@
     }
   }
 
-  __ LeaveInternalFrame();
+  // Leave the internal frame.
+}
 
   // Now that the break point has been handled, resume normal execution by
   // jumping to the target address intended by the caller and that was