Debugger: make debug code on-stack replacement more robust.

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index f5780a40bdbad57c7a93a48aadf7c34dc3365a25..17dcdc73ff7ac3a191ee5019b8606e1f58ffca4a 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -1617,6 +1617,9 @@ class Assembler : public AssemblerBase {
   // Mark address of the ExitJSFrame code.
   void RecordJSReturn();
 
+  // Mark generator continuation.
+  void RecordGeneratorContinuation();
+
   // Mark address of a debug break slot.
   void RecordDebugBreakSlot();
   void RecordDebugBreakSlotForCall(int argc);