RFR: 8341587: [premain] Support Soft/Weak Reference in AOT cache [v2]

[Mat Carter]

> Add support to the AOT cache for References (soft, weak and phantom)
> Remove the workarounds that were added because References weren't supported
> 
> Confirmed from logs that References are stored in the cache correctly
> 
> All demos run successfully on osx

Mat Carter has updated the pull request incrementally with one additional commit since the last revision:

  Fix style issue

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Changes:
  - all: https://git.openjdk.org/leyden/pull/41/files
  - new: https://git.openjdk.org/leyden/pull/41/files/929f700f..447d3121

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=leyden&pr=41&range=01
 - incr: https://webrevs.openjdk.org/?repo=leyden&pr=41&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/leyden/pull/41.diff
  Fetch: git fetch https://git.openjdk.org/leyden.git pull/41/head:pull/41

PR: https://git.openjdk.org/leyden/pull/41