RFR: 8284642: Unexpected behavior of -XX:MaxDirectMemorySize=0

[Harold Seigel]

Please review this small fix for JDK-8284642.  The fix was tested by running Mach5 tiers 1-2 on Linux, Mac OS, and Windows, and Mach5 tiers 3-5 on Linux x64.  Additionally, the modified test and the test in the bug report were run locally.

Thanks, Harold

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Commit messages:
 - 8284642: Unexpected behavior of -XX:MaxDirectMemorySize=0

Changes: https://git.openjdk.java.net/jdk/pull/8222/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8222&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284642
  Stats: 7 lines in 2 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8222.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8222/head:pull/8222

PR: https://git.openjdk.java.net/jdk/pull/8222