RFR: 8334870: javac does not accept classfiles with certain permitted RuntimeVisibleParameterAnnotations and RuntimeInvisibleParameterAnnotations attributes [v3]

[Jan Lahoda]

> JVMS 4.7.18 and 4.7.19 say this about the entries in the RuntimeVisibleParameterAnnotations and RuntimeInvisibleParameterAnnotations attributes:
> 
>> The i'th entry in the parameter_annotations table may, but is not required to, correspond to the i'th parameter descriptor in the method descriptor (§4.3.3).
> 
> When reading classfiles, javac does not follow this specification (which puts no requirements on the number of entries in the attributes), but rather expects as many entries as the `MethodSymbol.type` has (which is either based in the `Signature` attribute, if present, or the method descritor, if `Signature` is not present).
> 
> This patch proposes to adjust javac to accept the attributes with any number of entries, implementing a number of heuristics to map the content of the entries in the attributes to the parameters. There are comments in the code explaining the heuristics.
> 
> javac will ignore the RuntimeVisibleParameterAnnotations and RuntimeInvisibleParameterAnnotations attributes it cannot handle with a warning.

Jan Lahoda 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 nine additional commits since the last revision:

 - Adjusting test to an updated ClassFile API.
 - Merge branch 'master' into JDK-8024694
 - Merge branch 'master' into JDK-8024694
 - Reflecting review feedback.
 - Adding a new bug number.
 - Adjusting heuristics.
 - Fixing tests.
 - Fixing tests.
 - 8024694: javac always expects signature attribute for enum constructors

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19860/files
  - new: https://git.openjdk.org/jdk/pull/19860/files/3404a1f0..5d8cafbd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19860&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19860&range=01-02

  Stats: 118935 lines in 2906 files changed: 73366 ins; 29285 del; 16284 mod
  Patch: https://git.openjdk.org/jdk/pull/19860.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19860/head:pull/19860

PR: https://git.openjdk.org/jdk/pull/19860