[clang] [clang][Driver][OpenMP][SPIR-V] Fix SPIR-V OpenMP DeviceRTL expected file name (PR #141855)

[Nick Sarnie via cfe-commits]

sarnex wrote:

Right now we don't even build the DeviceRTL for SPIR-V, however I do have it built locally and I ran into this issue there.

https://github.com/llvm/llvm-project/pull/141855