[lworld] RFR: 8378697: [lworld] Remove jdk/internal/reflect hack for ClassFileParser::verify_legal_class_name

[Chen Liang]

This was added in 6d0ecdf384c261c5501f52a1359c0703069b1981 to support Q-descriptors. Now both the Q descriptors and the old reflection accessor are both gone, let's nuke this dead code.

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Commit messages:
 - 8378697: [lworld] Remove jdk/internal/reflect hack for ClassFileParser::verify_legal_class_name

Changes: https://git.openjdk.org/valhalla/pull/2165/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2165&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378697
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/2165.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2165/head:pull/2165

PR: https://git.openjdk.org/valhalla/pull/2165