[CUDA] Mark device functions as nounwind.

[CUDA] Mark device functions as nounwind.

Summary:
This prevents clang from emitting 'invoke's and catch statements.

Things previously mostly worked thanks to TryToMarkNoThrow() in
CodeGenFunction.  But this is not a proper IPO, and it doesn't properly
handle cases like mutual recursion.

Fixes bug 30593.

Reviewers: tra

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D25166

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@283272 91177308-0d34-0410-b5e6-96231b3b80d8