This patch adds a new class NameHashTableBuilder which creates /names streams.
This patch contains a test to confirm that a stream created by
NameHashTableBuilder can be read by NameHashTable reader class.
Differential Revision: https://reviews.llvm.org/D28707
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292040 91177308-0d34-0410-b5e6-96231b3b80d8