RFR: 8252530: Fix inconsistencies in hotspot whitebox

[Philippe Marschall]

Replace the runtime check and remove the "InVmBuild" suffix as described in the bug.

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Commit messages:
 - 8252530: Fix inconsistencies in hotspot whitebox

Changes: https://git.openjdk.java.net/jdk/pull/3924/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3924&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252530
  Stats: 21 lines in 6 files changed: 4 ins; 0 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3924.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3924/head:pull/3924

PR: https://git.openjdk.java.net/jdk/pull/3924