Fix issue with Tpi Stream hash map.

Part of the patch to not build the hash map eagerly was omitted
due to a merge conflict.  Add it back, which should fix the failing
tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348166 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed