hg: jdk/jdk: 8244936: Reduce JNI overhead of accessing FileDescriptor

[claes.redestad at oracle.com]

Changeset: ab5848d09175
Author:    redestad
Date:      2020-05-13 22:25 +0200
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/ab5848d09175

8244936: Reduce JNI overhead of accessing FileDescriptor
Reviewed-by: rriggs, alanb

! src/java.base/share/native/libjava/FileInputStream.c
! src/java.base/share/native/libjava/RandomAccessFile.c
! src/java.base/share/native/libjava/io_util.c
! src/java.base/unix/native/libjava/io_util_md.c
! src/java.base/unix/native/libjava/io_util_md.h
! src/java.base/windows/native/libjava/io_util_md.c
! src/java.base/windows/native/libjava/io_util_md.h
! test/micro/org/openjdk/bench/java/io/RandomAccessRead.java