RFR: 8255729: com.sun.tools.javac.processing.JavacFiler.FilerOutputStream is inefficient [v2]

[Guoxiong Li]

> Hi all,
> 
> `FilerOutputStream` extends `FilterOutputStream` without overwriting the method `write(byte b[], int off, int len)` which would suffer from the performance problem.
> This patch fixes it and adds some `@Override` to polish the code. But I can't find a good way to write a corresponding test case. Maybe it doesn't need a test case. And all existing tests in `test/langtools/tools/javac` passed locally.
> 
> Thank you for taking the time to review.
> 
> Best Regards.

Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:

  Use Objects::checkFromIndexSize

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1854/files
  - new: https://git.openjdk.java.net/jdk/pull/1854/files/02a3fd1e..ed1d7320

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1854&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1854&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1854.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1854/head:pull/1854

PR: https://git.openjdk.java.net/jdk/pull/1854