RFR: 8294961: java.base java.lang.reflect.ProxyGenerator uses ASM to generate proxy classes [v6]

[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 196 commits:

 - 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
 - EntryMap::nextPowerOfTwo delegates to Long:numberOfLeadingZeros
 - fixed CodeBuilder:constantInstruction for -0.0d and -0.0f values and added test
 - Merge branch 'master' into JDK-8294982
 - fixed new lines at end of file
 - package jdk.internal.classfile.jdktypes moved to jdk.internal.classfile.java.lang.constant
 - ... and 186 more: https://git.openjdk.org/jdk/compare/e26cc526...951b1bc7

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Changes: https://git.openjdk.org/jdk/pull/10991/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10991&range=05
  Stats: 465 lines in 2 files changed: 48 ins; 199 del; 218 mod
  Patch: https://git.openjdk.org/jdk/pull/10991.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10991/head:pull/10991

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