Gracefully handle unloaded scripts

test/cctest/test-heap-profiler.cc

Index: test/cctest/test-heap-profiler.cc
diff --git a/test/cctest/test-heap-profiler.cc b/test/cctest/test-heap-profiler.cc
index 87119b8571394118af54f9e48b6124faad2ca70d..a4218f31b2dfde6a45633cad6cab5428e1224283 100644
--- a/test/cctest/test-heap-profiler.cc
+++ b/test/cctest/test-heap-profiler.cc
@@ -2872,7 +2872,6 @@ static const v8::AllocationProfile::Node* FindAllocationProfileNode(
   return node;
 }
 
-
 TEST(SamplingHeapProfiler) {
   v8::HandleScope scope(v8::Isolate::GetCurrent());
   LocalContext env;
@@ -2985,6 +2984,23 @@ TEST(SamplingHeapProfiler) {
 
     heap_profiler->StopSamplingHeapProfiler();
   }
+
+  // A test case with scripts unloaded before profile gathered
+  {
+    heap_profiler->StartSamplingHeapProfiler(64);
+    CompileRun(
+        "for (var i = 0; i < 1024; i++) {\n"
+        "  eval(\"new Array(100)\");\n"
+        "}\n");
+
+    CcTest::heap()->CollectAllGarbage();
+
+    v8::base::SmartPointer<v8::AllocationProfile> profile(
+        heap_profiler->GetAllocationProfile());
+    CHECK(!profile.is_empty());
+
+    heap_profiler->StopSamplingHeapProfiler();
+  }
 }