gdb/testsuite: add HIP graph-launch kernel debugging test

[spatrang]

Summary

Adds a new gdb.rocm dejagnu test, hip-graph-launch, covering debugging of
kernels dispatched through a HIP graph (hipGraphLaunch) rather than a plain
kernel<<<>>>() launch. The program captures two kernels (add_one then
times_three) from a stream into a single graph, instantiates it, and replays
it 3 times; each replay computes out = (out + 1) * 3 (0 -> 3 -> 12 -> 39).

The test exercises the graph-specific debugger behavior:

• pending breakpoints in graph-launched kernels resolve and hit,
• both graph nodes stop in order on every replay (dispatch numbering / re-dispatch),
• correct per-replay data is observed at each node,
• symbol breakpoint + backtrace + kernel-argument inspection,
• single-stepping inside a graph-launched kernel mutates device memory,
• info dispatches reports the active dispatch and associates it with the kernel.

Test plan

Validated 22/22 assertions under both GCC and LLVM host compilers on gfx942
(MI300X), against:

• locally built ROCgdb (gdb 18.0.50), and
• nightly ROCm 7.14 rocgdb (gdb 16.3).

JIRA

AIROCGDB-580

[spatrang]

Rebased onto latest amd-staging to pick up the record-full.c build fix and re-trigger CI.

[lancesix]

Just minor comments for now, will get a deeper review at a later time.

[spatrang]

Addressed review comments :

• Use the shared CHECK macro from rocm-test-utils.h instead of a local copy.
• num_elems is now constexpr.
• Keep the replay count in sync: the .exp passes -DNUM_REPLAYS=$num_replays and the source guards the define with #ifndef (per the nonstop-mode.exp pattern).

Also rebased onto latest amd-staging.

[aktemur]

Assigning to myself to reduce the load on @lancesix.
@lancesix, feel free to assign it back to yourself.

[spatrang]

Addressed @aktemur's review comments (force-pushed):

• Removed the backtrace, single-step, and info dispatches tests; kept only the graph-specific replay/ordering test.
• Inlined continue_to_kernel into plain gdb_test calls and shortened the stop regexps.
• clean_restart $::testfile and $inferior_exited_re for the exit match.
• Declared variables at first use in the .cpp; removed a redundant comment.

[lancesix]

Assigning to myself to reduce the load on @lancesix. @lancesix, feel free to assign it back to yourself.

Thanks.

I had a quick pass at the current iteration, and that seems reasonable to me. Make that a +1 from me.

[aktemur]

LGTM. Thanks.

[lumachad]

Some nits, but otherwise LGTM.

[spatrang]

Addressed @lumachad's comments (force-pushed): clarified the "launch graph" execution path in both the .cpp and .exp headers (and near hipGraphLaunch), and cleaned up the bullet list (kept as a list, dropped trailing commas). Comment-only changes; retested 13/13 under GCC and LLVM.