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

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 49e1acf50b3ec4f8bcf143b593fdabdd1a33a15b..fc67c7e7fb589385fbd41d6199374340a4bf4bb8 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -770,7 +770,9 @@ const char* RelocInfo::RelocModeName(RelocInfo::Mode rmode) {
     case DEBUG_BREAK_SLOT:
       return "debug break slot";
     case CODE_AGE_SEQUENCE:
-      return "code_age_sequence";
+      return "code age sequence";
+    case GENERATOR_CONTINUATION:
+      return "generator continuation";
     case NUMBER_OF_MODES:
     case PC_JUMP:
       UNREACHABLE();
@@ -871,6 +873,7 @@ void RelocInfo::Verify(Isolate* isolate) {
     case CONST_POOL:
     case VENEER_POOL:
     case DEBUG_BREAK_SLOT:
+    case GENERATOR_CONTINUATION:
     case NONE32:
     case NONE64:
       break;
@@ -1821,6 +1824,12 @@ void Assembler::RecordJSReturn() {
 }
 
 
+void Assembler::RecordGeneratorContinuation() {
+  EnsureSpace ensure_space(this);
+  RecordRelocInfo(RelocInfo::GENERATOR_CONTINUATION);
+}
+
+
 void Assembler::RecordDebugBreakSlot() {
   EnsureSpace ensure_space(this);
   intptr_t data = static_cast<intptr_t>(RelocInfo::kDebugBreakNonCallSentinel);