RFR: 8294961: Convert java.base/java.lang.reflect.ProxyGenerator to use the Classfile API to generate proxy classes [v9]

[Adam Sotona]

> java.base java.lang.reflect.ProxyGenerator uses ASM to generate proxy classes and this patch converts it to use Classfile API.
> 
> Please review.
> 
> Thank you,
> Adam

Adam Sotona has updated the pull request incrementally with two additional commits since the last revision:

 - ClassEntry caching ClassDesc to improve performance
 - MethodTypeDesc performance improvements

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10991/files
  - new: https://git.openjdk.org/jdk/pull/10991/files/2b23276a..ea974be7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10991&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10991&range=07-08

  Stats: 29 lines in 4 files changed: 19 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/10991.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/10991/head:pull/10991

PR: https://git.openjdk.org/jdk/pull/10991