RFR: 8298639: Perform I/O operations in bulk for RandomAccessFile

[Per Minborg]

This PR suggests improving performance for read and write operations for the longer primitives in `RandomAccessFile`.

These improvements would also propagate to other JDK classes relying on these improved `RandomAccessFile` operations.

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Commit messages:
 - Perform I/O operations in bulk for RandomAccessFile

Changes: https://git.openjdk.org/jdk/pull/11644/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11644&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298639
  Stats: 61 lines in 2 files changed: 19 ins; 16 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/11644.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11644/head:pull/11644

PR: https://git.openjdk.org/jdk/pull/11644