cb75432ac4
1. Added feature for __threadfence and __threadfence_block
2. Added feature for using LLVM IR files directly while compilation
3. Added test for threadfence and threadfence_block
Change-Id: Ib7e5d89b4cca1a135952b317e5809cd05b56a3c9
[ROCm/hip commit: dc1042ce6d]