CUDA: add -fcuda-is-device flag

This frontend-only flag is used by the IR generator to determine
whether to filter CUDA declarations for the host or for the device.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141301 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed