[code-reflection] RFR: HIP HAT backend

[iotamudelta]

* Use the C99 code path to generate HIP-compliant kernel code.
* Runtime compilation through hipRTC.
* Use standard HIP malloc/free, device inspection for infrastructure.
* Integrate into HAT compilation and examples.
* Confirmed to work on AMD Radeon RX 68000XT w/ ROCm 6.2.2

hipinfo output:
> Using device 0: AMD Radeon RX 6800 XT
> HIP Device has major=10 minor=3 compute capability
> HIP Device has wave front size 32
> HIP Device has threadsPerBlock 1024
> HIP Cores 36
  Total amount of global memory:   17163091968
  64-bit Memory Address:           YES

mandel example:


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            ...............,...,......,:                     :,,
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            ...............,,+,, ,-,,,*                       ,.
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           ...............,,        #,                        ,.
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           ............,-:,                                   ..
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Commit messages:
 - Merge branch 'code-reflection' into hip_backend
 - Fix whitespace.
 - Merge branch 'openjdk:code-reflection' into hip_backend
 - Add a HIP backend.

Changes: https://git.openjdk.org/babylon/pull/254/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=254&range=00
  Stats: 687 lines in 13 files changed: 685 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/babylon/pull/254.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/254/head:pull/254

PR: https://git.openjdk.org/babylon/pull/254