RFR: 8352980: Purge infrastructure for FP-to-bits interpreter intrinsics after 32-bit x86 removal

[Aleksey Shipilev]

[JDK-8076373](https://bugs.openjdk.org/browse/JDK-8076373) added the infrastructure to implement `_intBitsToFloat`, `_floatToRawIntBits`, `_longBitsToDouble`, `_doubleToRawLongBits` intrinsics in template interpreters. That work was needed to support NaNs for 32-bit x86, and is no longer needed.

I did not do deep testing, because the removed code is actually dead.

Additional testing:
 - [ ] GHA checks for platform builds
 - [ ] Linux x86_64 server fastdebug, `tier1`

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jdk/pull/24259/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24259&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352980
  Stats: 95 lines in 11 files changed: 0 ins; 95 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24259.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24259/head:pull/24259

PR: https://git.openjdk.org/jdk/pull/24259