2nd try to fix leakage of the module provider. note that moduleprovider takes...

2nd try to fix leakage of the module provider. note that moduleprovider takes ownership of the module

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58128 91177308-0d34-0410-b5e6-96231b3b80d8