[jdk11u-dev] RFR: 8255729: com.sun.tools.javac.processing.JavacFiler.FilerOutputStream is inefficient

[Guoxiong Li]

Hi all,

Request to backport [JDK-8255729](https://bugs.openjdk.org/browse/JDK-8255729) to jdk11. The code doesn't apply cleanly. Because the [JDK-8236435](https://bugs.openjdk.org/browse/JDK-8236435) whcih fixed typos changed the file `JavacFiler.java` as well. I try to backport JDK-8236435 to let this patch clean but the JDK-8236435 has many conflicts so that it is not easy to backport. So I decide not to backport JDK-8236435. I have backported [JDK-8193462](https://bugs.openjdk.org/browse/JDK-8193462) to jdk11 in order to make this patch clean but unfortunately the clean backport is blocked by JDK-8236435.

Thanks for taking the time to review.

Best Regrads,
-- Guoxiong

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Commit messages:
 - Backport 526c00057e7e0c5ac82ae7071792f454420fdec1

Changes: https://git.openjdk.org/jdk11u-dev/pull/1218/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1218&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8255729
  Stats: 9 lines in 1 file changed: 8 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1218.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1218/head:pull/1218

PR: https://git.openjdk.org/jdk11u-dev/pull/1218