[demangler] Support for <template-param>s in generic lambdas.

These <template-param>s refer to "artifical" <template-arg>s that don't appear
in the mangled name, so we just print them as "auto".

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@327690 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed