RFR: 6478546: FileInputStream.read() throws OutOfMemoryError when there is plenty available [v8]

[Brian Burkhalter]

> Modify native multi-byte read-write code used by the `java.io` classes to limit the size of the allocated native buffer thereby decreasing off-heap memory footprint and increasing throughput.

Brian Burkhalter 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 14 additional commits since the last revision:

 - 6478546: Eliminate a subtraction from RandomAccessFile.bufferSize()
 - Merge
 - 6478546: Miscellaneous cleanup
 - Merge
 - Merge
 - 6478546: Use dynamically sized temporary direct buffers
 - Merge
 - Merge
 - 6478546: Add break in write loop on ExceptionOccurred
 - Merge
 - ... and 4 more: https://git.openjdk.org/jdk/compare/8ee41b0d...9d7e4fbf

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Changes:
  - all: https://git.openjdk.org/jdk/pull/8235/files
  - new: https://git.openjdk.org/jdk/pull/8235/files/9a138636..9d7e4fbf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=8235&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=8235&range=06-07

  Stats: 12332 lines in 522 files changed: 6560 ins; 4360 del; 1412 mod
  Patch: https://git.openjdk.org/jdk/pull/8235.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/8235/head:pull/8235

PR: https://git.openjdk.org/jdk/pull/8235