[openmp] Default to new rtl for amdgpu

Reverts D114965 as the compiler backend appears to be working again

Reviewed By: jhuber6

Differential Revision: https://reviews.llvm.org/D115157

GitOrigin-RevId: 6bb2a4f3e6546dc854a6f0dd37d81590e0b2990e
3 files changed