RFR: 8350086: Inline hot Method accessors for faster task selection [v2]

[Aleksey Shipilev]

> These methods show up prominently on Leyden profiles, as compilation policy asks these properties for methods very often during compile task selection:
>  - `Method::invocation_count`
>  - `Method::backedge_count`
>  - `Method::highest_comp_level`
> 
> We can move the definitions for these methods to method.inline.hpp to make them eligible for better inlining.
> 
> `interpreter_invocation_count()` method is a bit weird, looks like a leftover from [JDK-8251462](https://bugs.openjdk.org/browse/JDK-8251462). Removing it would prompt more cleanups and renamings in `ciMethod`, so I would leave it for future enhancement.
> 
> Additional testing: 
>  - [x] Spot-checked Leyden profiles, methods are now fully inlined into hot `CompilerBroker` methods
>  - [x] Ad-hoc Leyden benchmarks show minor improvements (< 1%) for time spent in compiler threads

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Adjust includes to match the move

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23634/files
  - new: https://git.openjdk.org/jdk/pull/23634/files/845dc7d5..8f6d4fab

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23634&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23634&range=00-01

  Stats: 2 lines in 2 files changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23634.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23634/head:pull/23634

PR: https://git.openjdk.org/jdk/pull/23634