[CUDA] Disable LTO for device-side compilations.

[CUDA] Disable LTO for device-side compilations.

This fixes host-side LTO during CUDA compilation. Before, LTO
pipeline construction was clashing with CUDA pipeline construction.

At the moment there's no point doing LTO on device side as each
device-side TU is a complete program.  We will need to figure out
compilation pipeline construction for the device-side LTO when we
have working support for multi-TU device-side CUDA compilation.

Differential Revision: https://reviews.llvm.org/D44691

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@328161 91177308-0d34-0410-b5e6-96231b3b80d8