Delete all of the CodeGenInstructions from CodeGenTarget destructor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200906 91177308-0d34-0410-b5e6-96231b3b80d8
A memcpy out of an fresh alloca is a no-op, delete it. Patch by Patrick Walton!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200907 91177308-0d34-0410-b5e6-96231b3b80d8