RFR: 8348556: Inlining fails earlier for MemorySegment::reinterpret

[Per Minborg]

This PR proposes to add some `@ForceInline` annotations in the `Module` class in order to assist inlining of FFM var/method handles.

Tested and passed tier1-3

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Commit messages:
 - Add @ForceInline annotations and restructure some methods

Changes: https://git.openjdk.org/jdk/pull/23460/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23460&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348556
  Stats: 57 lines in 1 file changed: 26 ins; 4 del; 27 mod
  Patch: https://git.openjdk.org/jdk/pull/23460.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23460/head:pull/23460

PR: https://git.openjdk.org/jdk/pull/23460