[jdk25u] RFR: 8360178: TestArguments.atojulong gtest has incorrect format string

[Jayashree S Kumar]

A clean backport for [JDK-8360178](https://bugs.openjdk.org/browse/JDK-8360178)

This patch is to fix format directive when printing ULLONG_MAX by TestArguments.atojulong gtest. Instead of using JULONG_FORMAT, which might not be the proper type (though sized properly), use "%llu" to avoid potential warning.

Backporting this patch can help fix test gtest gap. 

Testing: mach5 tier1

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Commit messages:
 - Backport 878497fb85b9f7d066829b745324028f9f8cdc60

Changes: https://git.openjdk.org/jdk25u/pull/228/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=228&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360178
  Stats: 4 lines in 1 file changed: 2 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk25u/pull/228.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/228/head:pull/228

PR: https://git.openjdk.org/jdk25u/pull/228