RFR: 8357581: [JVMCI] Add ProfilingInfo.getDecompileCount

[Doug Simon]

Graal is adding enhanced logic to detect deoptimization cycles and needs to be able to query a method's decompilation counter (i.e. `MethodData::_compiler_counters._nof_decompiles`).
This PR adds the `HotSpotProfilingInfo` interface so that such HotSpot-specific profiling info can be accessed.
The change looks bigger in the GitHub review UI than it really is. I have simply renamed the pre-existing `HotSpotProfilingInfo` private class as `HotSpotProfilingInfoImpl` and repurposed the `HotSpotProfilingInfo` name for the *new* public interface.

-------------

Commit messages:
 - added HotSpotProfilingInfo

Changes: https://git.openjdk.org/jdk/pull/25397/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25397&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357581
  Stats: 235 lines in 5 files changed: 17 ins; 194 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/25397.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25397/head:pull/25397

PR: https://git.openjdk.org/jdk/pull/25397