[code-reflection] RFR: [hat] Enable PROFILE_CUDA_KERNEL option

[Juan Fumero]

This PR adds a new option to profiler CUDA kernels (`PROFILE_CUDA_KERNEL`).

How to use it?


HAT=PROFILE_CUDA_KERNEL java -cp hat/job.jar hat.java run ffi-cuda ....

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Commit messages:
 - [hat] Enable PROFILE_CUDA_KERNEL option

Changes: https://git.openjdk.org/babylon/pull/639/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=639&range=00
  Stats: 48 lines in 4 files changed: 30 ins; 2 del; 16 mod
  Patch: https://git.openjdk.org/babylon/pull/639.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/639/head:pull/639

PR: https://git.openjdk.org/babylon/pull/639