Version 5.1.281.67 (cherry-pick)

src/crankshaft/hydrogen-instructions.cc

Index: src/crankshaft/hydrogen-instructions.cc
diff --git a/src/crankshaft/hydrogen-instructions.cc b/src/crankshaft/hydrogen-instructions.cc
index 7de8b5d4a297186ac44c4ff8dd194742755136c3..b57bebd8fca0523f6d5600d5c2bbd1f6040f2980 100644
--- a/src/crankshaft/hydrogen-instructions.cc
+++ b/src/crankshaft/hydrogen-instructions.cc
@@ -1203,7 +1203,6 @@ namespace {
 String* TypeOfString(HConstant* constant, Isolate* isolate) {
   Heap* heap = isolate->heap();
   if (constant->HasNumberValue()) return heap->number_string();
-  if (constant->IsUndetectable()) return heap->undefined_string();
   if (constant->HasStringValue()) return heap->string_string();
   switch (constant->GetInstanceType()) {
     case ODDBALL_TYPE: {
@@ -1232,6 +1231,7 @@ String* TypeOfString(HConstant* constant, Isolate* isolate) {
       return nullptr;
     }
     default:
+      if (constant->IsUndetectable()) return heap->undefined_string();
       if (constant->IsCallable()) return heap->function_string();
       return heap->object_string();
   }