RFR: 8310848: Convert ClassDesc and MethodTypeDesc to be stored in static final fields [v4]

[Chen Liang]

> This would encourage Classfile API users to use the descriptors as constants, which can improve performance by avoiding repeated validation and reusing cached descriptor strings for MethodTypeDesc. This patch updates usages in the main codebase and benchmarks; tests are left untouched.

Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - Merge branch 'master' into fix/cd-usage
 - Merge branch 'master' into fix/cd-usage
 - Fix build
 - 8310848: Convert ClassDesc and MethodTypeDesc to be stored in static final fields

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Changes: https://git.openjdk.org/jdk/pull/14640/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14640&range=03
  Stats: 241 lines in 6 files changed: 61 ins; 94 del; 86 mod
  Patch: https://git.openjdk.org/jdk/pull/14640.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14640/head:pull/14640

PR: https://git.openjdk.org/jdk/pull/14640