RFR: 8273092: Sort classlist in JDK image [v2]

[Ioi Lam]

> When the classlist is generated using build.tools.classlist.HelloClasslist, its contents may be non-deterministic due to Java thread execution order.
> 
> We should sort the generated classlist to make the JDK image's contents more deterministic.
> 
> Tested with Mach5 tier1, tier2, builds-tier5

Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:

  @dfuch comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5288/files
  - new: https://git.openjdk.java.net/jdk/pull/5288/files/dc170ec0..ee710895

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5288&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5288&range=00-01

  Stats: 15 lines in 1 file changed: 7 ins; 7 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5288.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5288/head:pull/5288

PR: https://git.openjdk.java.net/jdk/pull/5288