[SE] Support CUDA dynamic shared memory

Summary:
Add proper handling for shared memory arguments in the CUDA platform. Also add
in unit tests for CUDA.

Reviewers: jlebar

Subscribers: beanz, mgorny, jprice, jlebar, parallel_libs-commits

Differential Revision: https://reviews.llvm.org/D24596

llvm-svn: 281635
GitOrigin-RevId: 70720a7e1b149fc22a53891711aa9ddf2d947890