SILGen: Don't ask for captures of things that can't have captures

Author: slavapestov

lib/SILGen/SILGenFunction.cpp

@@ -1002,7 +1002,7 @@ SILGenFunction::emitClosureValue(SILLocation loc, SILDeclRef constant,
   // If we're in top-level code, we don't need to physically capture script
   // globals, but we still need to mark them as escaping so that DI can flag
   // uninitialized uses.
-  if (isEmittingTopLevelCode()) {
+  if (isEmittingTopLevelCode() && dc->getParentSourceFile()) {
     auto captureInfo = closure.getCaptureInfo();
     emitMarkFunctionEscapeForTopLevelCodeGlobals(loc, captureInfo);
   }

lib/SILGen/SILGenTopLevel.cpp

@@ -369,6 +369,8 @@ static void emitMarkFunctionEscape(SILGenFunction &SGF,
   if (AFD->getDeclContext()->isLocalContext())
     return;
   auto CaptureInfo = AFD->getCaptureInfo();
+  if (!CaptureInfo.hasBeenComputed())
+    return;
   SGF.emitMarkFunctionEscapeForTopLevelCodeGlobals(AFD, std::move(CaptureInfo));
 }