Delete dead code.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185119 91177308-0d34-0410-b5e6-96231b3b80d8
Update for llvm::sys::fs::unique_file not creating directories.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185127 91177308-0d34-0410-b5e6-96231b3b80d8
Lazily deserialize function template specializations. This fixes a cycle in
module deserialization / merging, and more laziness here is general goodness.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185132 91177308-0d34-0410-b5e6-96231b3b80d8