RFR: 8294961: Convert java.base/java.lang.reflect.ProxyGenerator to use the Classfile API to generate proxy classes [v10]

[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 with a new target base due to a merge or a rebase. The pull request now contains 201 commits:

 - Merge branch 'master' into JDK-8294961
   
   # Conflicts:
   #	src/java.base/share/classes/java/lang/reflect/ProxyGenerator.java
 - ClassEntry caching ClassDesc to improve performance
 - MethodTypeDesc performance improvements
 - improved method descriptor construction
 - Apply suggestions from code review
   
   Co-authored-by: liach <7806504+liach at users.noreply.github.com>
 - Merge branch 'master' into JDK-8294961-proxy
 - Merge branch 'master' into JDK-8294961-proxy
 - Merge branch 'JDK-8294982' into JDK-8294961
 - removed obsolete javadoc from implementation classes
 - minor fix in CodeBuilder and added test cases to LDCTest
 - ... and 191 more: https://git.openjdk.org/jdk/compare/a2d8f634...2787185c

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Changes: https://git.openjdk.org/jdk/pull/10991/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10991&range=09
  Stats: 489 lines in 6 files changed: 63 ins; 193 del; 233 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