Mark as referenced the functions from instantiated UserDefinedLiterals.

Fixes rdar://13589856

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179078 91177308-0d34-0410-b5e6-96231b3b80d8
Skip transparent contexts when looking for using directives in name lookup.

Fixes the bootstrap regression I introduced in r179067.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179079 91177308-0d34-0410-b5e6-96231b3b80d8
When checking for illegal expressions in a default-argument
expression, look through pseudo-object expressions.

rdar://13602832

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179080 91177308-0d34-0410-b5e6-96231b3b80d8