[jdk11u-dev] RFR: 8303937: Corrupted heap dumps due to missing retries for os::write()

[Man Cao]

https://bugs.openjdk.org/browse/JDK-8303937 fixes a real bug that causes heap dump corruption. This bug was introduced into 11.0.14u.

Trivial merge conflict, resolved by removing (ssize_t) cast before os::write().

I'll need a sponsor to help push this into 11u-dev.

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Commit messages:
 - Backport bf16b5b9880eb89b283006db090dce4346aa877b

Changes: https://git.openjdk.org/jdk11u-dev/pull/1801/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1801&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303937
  Stats: 8 lines in 1 file changed: 4 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1801.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1801/head:pull/1801

PR: https://git.openjdk.org/jdk11u-dev/pull/1801