RFR: 8366498: Simplify ClassFileParser::parse_super_class [v3]

[Ioi Lam]

> The if `cp->resolved_klass_at()` is never true called because we are very early in class file parsing, so no klass CP entries have been resolved at this point.

Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:

  removed test-only assert

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27026/files
  - new: https://git.openjdk.org/jdk/pull/27026/files/dec4af73..256716fc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27026&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27026&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27026.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27026/head:pull/27026

PR: https://git.openjdk.org/jdk/pull/27026