RFR: 8284642: Unexpected behavior of -XX:MaxDirectMemorySize=0 [v2]

[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

Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:

  restore source, fix man page

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8222/files
  - new: https://git.openjdk.java.net/jdk/pull/8222/files/c178c602..5fdb220a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8222&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8222&range=00-01

  Stats: 9 lines in 3 files changed: 0 ins; 0 del; 9 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