[SPIR-V] Add translator tool

Add a tool for constructing commands for translating LLVM IR to
SPIR-V.

Used by HIPSPV tool chain (D110618).

Reviewed By: bader

Differential Revision: https://reviews.llvm.org/D112404

GitOrigin-RevId: 49682f14bf3fb8db5e2721d9896b27bb4c2bd635
3 files changed