[OpenMP][SPIRV] `__builtin_trap` on the device doesn't cause a failure

`./bin/llvm-lit runtimes/runtimes-bins/offload/test/spirv64-intel/offloading/assert.cpp`

runs without error while we expect the unconditional `__builtin_trap` in the device code to cause a crash.

Run ./bin/llvm-lit runtimes/runtimes-bins/offload/test/spirv64-intel/offloading/assert.cpp and inspect the referenced assert.cpp test and its device-code setup. Trace why the unconditional __builtin_trap does not produce the expected failure. Done means the test reliably reports the device failure instead of completing without error.

Written by the indexing model from the issue text.