RFR: 8294976: Convert Runtime classes to use the ClassFile API instead of ASM

[Oussama Louati]

8294976: Convert Runtime classes to use the ClassFile API instead of ASM

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Commit messages:
 - migrate loadClassData to use ClassFile API instead of ASM

Changes: https://git.openjdk.org/jdk/pull/18271/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18271&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294976
  Stats: 57 lines in 1 file changed: 11 ins; 16 del; 30 mod
  Patch: https://git.openjdk.org/jdk/pull/18271.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18271/head:pull/18271

PR: https://git.openjdk.org/jdk/pull/18271