Merge V8 5.3.332.45.  DO NOT MERGE

Test: Manual

FPIIM-449

Change-Id: Id3254828b068abdea3cb10442e0172a8c9a98e03
(cherry picked from commit 13e2dadd00298019ed862f2b2fc5068bba730bcf)
diff --git a/src/debug/s390/OWNERS b/src/debug/s390/OWNERS
index eb007cb..752e8e3 100644
--- a/src/debug/s390/OWNERS
+++ b/src/debug/s390/OWNERS
@@ -3,3 +3,4 @@
 joransiu@ca.ibm.com
 mbrandy@us.ibm.com
 michael_dawson@ca.ibm.com
+bjaideep@ca.ibm.com
diff --git a/src/debug/s390/debug-s390.cc b/src/debug/s390/debug-s390.cc
index c6764c2..9c33b95 100644
--- a/src/debug/s390/debug-s390.cc
+++ b/src/debug/s390/debug-s390.cc
@@ -45,7 +45,7 @@
 
 void DebugCodegen::PatchDebugBreakSlot(Isolate* isolate, Address pc,
                                        Handle<Code> code) {
-  DCHECK_EQ(Code::BUILTIN, code->kind());
+  DCHECK(code->is_debug_stub());
   CodePatcher patcher(isolate, pc, Assembler::kDebugBreakSlotLength);
   // Patch the code changing the debug break slot code from
   //