[lworld] RFR: 8361082: [lworld] RewriteBytecodesInlineTest fails with SIGSEGV [v2]

[Matias Saavedra Silva]

> `RewriteBytecodesInlineTest` fails after # due to a new log message printing the pending exception name even though there may not be a pending exception:
> `PENDING_EXCEPTION->klass()->name()->as_C_string()`
> 
> This patch refactors the loadable descriptor handling used in `SystemDictionary::load_shared_class` to better illustrate how the loadable descriptors property is handled and it corrects the log messages to be consistent with the messages used in the class file parser. Verified with tier 1-5 tests.

Matias Saavedra Silva has updated the pull request incrementally with one additional commit since the last revision:

  Added comments

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1498/files
  - new: https://git.openjdk.org/valhalla/pull/1498/files/52348059..122d1178

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1498&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1498&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/1498.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1498/head:pull/1498

PR: https://git.openjdk.org/valhalla/pull/1498