[smoke-dev] Add HipDevCov and OmpDevCov device-coverage drain tests

[lfmeadow]

Summary

Adds two test/smoke-dev tests that validate device-side PGO/coverage drainage via the in-tree HSA-introspection drain (upstream LLVM #203056), independent of the HIP host-shadow drain.

• HipDevCov — Builds a device-only kernel as a full executable so the device link pulls in the amdgcn profile runtime, extracts its code object (mod.co) via llvm-objdump --offloading, then hipModuleLoad()s it from a program where that kernel has no host shadow. Its counters can only reach the merged profile through the HSA drain. The test asserts both the host-shadow kernel and the module-only kernel are present (and intentionally does not unload the module, since the HSA drain runs at process exit on still-loaded code objects).
• OmpDevCov — OpenMP target offload has no host-shadow drain, so a -fprofile-generate → llvm-profdata merge → -fprofile-use round trip that consumes a device function's counters exercises the HSA drain exclusively.

Both tests honor $AOMP/$AOMP_GPU, use the existing smoke-dev Makefile.defs/Makefile.rules harness, set a 300s timeout, and skip cleanly on toolchains that do not yet ship the device profile runtime / HSA drain (so they won't red-fail CI before the drain lands in the bundled LLVM).

Test plan

• make check → TEST_STATUS=0 for both dirs on a gfx90a (MI210) box, using a toolchain containing the OpenMP runtime + device profile RT + HSA drain.
• HipDevCov: merged profile contains both host_kernel (host-shadow) and mod_kernel (HSA-only; gfx90a.hsa0.*.profraw produced).
• OmpDevCov: amdgcn-amd-amdhsa.*.profraw drained via HSA; FileCheck finds classify/__omp_offloading_; -fprofile-use rebuild consumes cleanly and runs.
• Verify under AOMP nightly once #203056 is in the bundled LLVM (until then the tests skip).

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