lli: avoid global variables, use a local unique_ptr instead

There was issue with order of destruction in some cases.

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266652 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed