Implement template instantiation for several more kinds of expressions:
  - C++ function casts, e.g., T(foo)
  - sizeof(), alignof()

More importantly, this allows us to verify that we're performing
overload resolution during template instantiation, with
argument-dependent lookup and the "cached" results of name lookup from
the template definition.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66947 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Type.cpp b/lib/AST/Type.cpp
index 1b7fc1b..fc71097 100644
--- a/lib/AST/Type.cpp
+++ b/lib/AST/Type.cpp
@@ -967,9 +967,12 @@
 }
 
 void ClassTemplateSpecializationType::Destroy(ASTContext& C) {
-  for (unsigned Arg = 0; Arg < NumArgs; ++Arg)
-    if (Expr *E = getArg(Arg).getAsExpr())
-      E->Destroy(C);
+  for (unsigned Arg = 0; Arg < NumArgs; ++Arg) {
+    // FIXME: Not all expressions get cloned, so we can't yet perform
+    // this destruction.
+    //    if (Expr *E = getArg(Arg).getAsExpr())
+    //      E->Destroy(C);
+  }
 }
 
 ClassTemplateSpecializationType::iterator