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

src/x87/assembler-x87.h

Index: src/x87/assembler-x87.h
diff --git a/src/x87/assembler-x87.h b/src/x87/assembler-x87.h
index d8c86abf7a06e46b377284789e48de23c2e9c28f..995b085440178653cfbc463dd0d669dd7505a498 100644
--- a/src/x87/assembler-x87.h
+++ b/src/x87/assembler-x87.h
@@ -954,6 +954,9 @@ 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();