The ClassFile API promotes usage of constant nominal descriptors over literal 
strings. However, for `class` file parsing, currently the efficient way to 
check if a constant pool entry matches a desired descriptor is via unrolling 
them back to strings. However, string unrolling is ugly, and often times 
confusing, such as internal names versus field descriptors.

As a result, I propose to provide new methods that compare constant pool 
entries with the potential symbolic descriptors they represent. This is no less 
efficient as checking raw string equality, avoids exceptional failure behaviors 
of conversion to symbolic descriptors, and avoids potential programmer errors 
stemming from raw string handling. See the CSR for a full story.

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Commit messages:
 - 8342206: Convenience method to check if a constant pool entry matches 
nominal descriptors

Changes: https://git.openjdk.org/jdk/pull/23548/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23548&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342206
  Stats: 413 lines in 9 files changed: 396 ins; 8 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/23548.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23548/head:pull/23548

PR: https://git.openjdk.org/jdk/pull/23548

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