RFR: JDK-8292903: enhance round_up_power_of_2 assertion output

[Matthias Baesken]

There is an assertion in round_up_power_of_2 for value <= max_power_of_2 of the type; would be nice to show the value of the problematic argument in case of failures.

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Commit messages:
 - JDK-8292903

Changes: https://git.openjdk.org/jdk/pull/10016/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10016&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292903
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10016.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10016/head:pull/10016

PR: https://git.openjdk.org/jdk/pull/10016