Handle missing scripts in CallSite.GetEvalOrigin

BUG=630950,631909

Review-Url: https://codereview.chromium.org/2184193004
Cr-Commit-Position: refs/heads/master@{#38133}

src/builtins/builtins-callsite.cc

@@ -219,6 +219,10 @@ BUILTIN(CallSitePrototypeGetEvalOrigin) {
   Handle<JSFunction> function = Handle<JSFunction>::cast(function_obj);
   Handle<Object> script = handle(function->shared()->script(), isolate);
 
+  if (!script->IsScript()) {
+    return *isolate->factory()->undefined_value();
+  }
+
   RETURN_RESULT_OR_FAILURE(
       isolate, FormatEvalOrigin(isolate, Handle<Script>::cast(script)));
 }

test/mjsunit/stack-traces.js

@@ -400,3 +400,14 @@ assertThrows(() => Error.captureStackTrace(x));
 var o = {};
 Error.stackTraceLimit = "not a number";
 Error.captureStackTrace(o);
+
+// Check that we don't crash when a callsite's function's script is empty.
+Error.prepareStackTrace = function(e, frames) {
+  assertEquals(undefined, frames[0].getEvalOrigin());
+}
+try {
+  DataView();
+  assertUnreachable();
+} catch (e) {
+  assertEquals(undefined, e.stack);
+}