RFR: 8226216: parameter modifiers are not visible to javac plugins across compilation boundaries [v3]

[Guoxiong Li]

> Hi all,
> 
> javac fails to read modifiers from the MethodParameters attribute in class files, which prevents plugins from accessing those modifiers across compilation boundaries. Because `com.sun.tools.javac.jvm.ClassReader` doesn't read and store the access flags(modifiers) from MethodParameters attribute.
> 
> This patch fixes it and adds a corresponding test case. All the existing tests of javac passed locally.
> 
> Thank you for taking the time to review.
> 
> Best Regards.

Guoxiong Li has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Use meaningful class name and update copyright
 - Merge branch 'master' into JDK-8226216
 - Modify legal header. Fix typo.
 - 8226216: parameter modifiers are not visible to javac plugins across compilation boundaries

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1890/files
  - new: https://git.openjdk.java.net/jdk/pull/1890/files/a074937f..6fb16609

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1890&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1890&range=01-02

  Stats: 379711 lines in 8961 files changed: 199371 ins; 123615 del; 56725 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1890.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1890/head:pull/1890

PR: https://git.openjdk.java.net/jdk/pull/1890