Statistic: Bring back printing on exit by default

Turns out several external projects relied on llvm printing statistics
on exit. Let's go back to this behaviour by default and have an optional
parameter to disable it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282532 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed