RFR: 8332528: Generate code in SwitchBootstraps.generateTypeSwitch that require fewer adaptations [v4]

[Claes Redestad]

> We can fold the call to `Objects.checkIndex` into the code generated in generateTypeSwitchSkeleton instead of doing so by filtering the MH argument. This loads 9 less classes (of which 8 generated LFs and Species classes) on a minimal test, while being neutral on a throughput sanity test:
> 
> 
> Name                   Cnt  Base   Error   Test   Error  Unit  Change
> SwitchSanity.switchSum  15 8,162 ± 0,117  8,152 ± 0,131 ns/op   1,00x (p = 0,800 )
>   * = significant
>   ```
> 
> A few additional optimizations includes moving some seldom used `findStatic` calls to a holder. All in all this means a reduction by 22M cycles to bootstrap a trivial switch expression on my M1.

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Remove unused import, revert left-overs in MethodTypeDescImpl

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19307/files
  - new: https://git.openjdk.org/jdk/pull/19307/files/f04d78ea..eb4babe5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19307&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19307&range=02-03

  Stats: 3 lines in 2 files changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/19307.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19307/head:pull/19307

PR: https://git.openjdk.org/jdk/pull/19307