Free 'TheTargetCodeGenInfo' in the class CodeGenModule. This looks like an...

Free 'TheTargetCodeGenInfo' in the class CodeGenModule.  This looks like an obvious memory leak that was reported from LLDB devs.  The comment indicates the leak is deliberate, but I have no idea why this needs to be so.  Please comment/revert if you know otherwise.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141479 91177308-0d34-0410-b5e6-96231b3b80d8