RFR: 6478546: FileInputStream.read() throws OutOfMemoryError when there is plenty available [v2]

[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 incrementally with one additional commit since the last revision:

  6478546: Decrease malloc'ed buffer maximum size to 64 kB

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8235/files
  - new: https://git.openjdk.java.net/jdk/pull/8235/files/8bb1e14f..40d46f8f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8235&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8235&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8235.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8235/head:pull/8235

PR: https://git.openjdk.java.net/jdk/pull/8235