Render anonymous entities as '(anonymous <thing>)' (and lambdas as '(lambda at ... )')

For namespaces, this is consistent with mangling and GCC's debug info
behavior. For structs, GCC uses <anonymous struct> but we prefer
consistency between all anonymous entities but don't want to confuse
them with template arguments, etc, so we'll just go with parens in all
cases.

llvm-svn: 205398
diff --git a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p19.cpp b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p19.cpp
index 8a6e792..35b7789 100644
--- a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p19.cpp
+++ b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p19.cpp
@@ -10,7 +10,7 @@
   auto lambda1 = [i]() { }; // expected-note 2 {{lambda expression begins here}}
 
   // Default constructor
-  decltype(lambda1) lambda2; // expected-error{{call to implicitly-deleted default constructor of 'decltype(lambda1)' (aka '<lambda}}
+  decltype(lambda1) lambda2; // expected-error{{call to implicitly-deleted default constructor of 'decltype(lambda1)' (aka '(lambda}}
 
   // Copy assignment operator
   lambda1 = lambda1; // expected-error{{copy assignment operator is implicitly deleted}}