Sema: Use a more specific type for ClosuresWithUncomputedCaptures

Author: slavapestov

lib/Sema/TypeChecker.cpp

@@ -554,7 +554,7 @@ static void typeCheckFunctionsAndExternalDecls(SourceFile &SF, TypeChecker &TC)
   TC.DelayedCircularityChecks.clear();
 
   // Compute captures for functions and closures we visited.
-  for (AnyFunctionRef closure : TC.ClosuresWithUncomputedCaptures) {
+  for (auto *closure : TC.ClosuresWithUncomputedCaptures) {
     TC.computeCaptures(closure);
   }
   TC.ClosuresWithUncomputedCaptures.clear();

lib/Sema/TypeChecker.h

@@ -557,7 +557,7 @@ class TypeChecker final : public LazyResolver {
 
   /// A list of closures for the most recently type-checked function, which we
   /// will need to compute captures for.
-  std::vector<AnyFunctionRef> ClosuresWithUncomputedCaptures;
+  std::vector<AbstractClosureExpr *> ClosuresWithUncomputedCaptures;
 
   /// Local functions that have been captured before their definitions.
   ///