Define a module map entry for ProfileData.

As per Richard Smith, this should help avoid a modules bug exposed
by my r275216 commit:
http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-modules/builds/17560

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275312 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed