RFR: 8267431: Rename InstanceKlass::has_old_class_version to can_be_verified_at_dumptime

[Calvin Cheung]

A simple patch for renaming the `InstanceKlass::has_old_class_version` function to `InstanceKlass::can_be_verified_at_dumptime`.

- [x] passed tier1, tier2 tests

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Commit messages:
 - 8267431: Rename InstanceKlass::has_old_class_version to can_be_verified_at_dumptime

Changes: https://git.openjdk.java.net/jdk/pull/4176/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4176&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267431
  Stats: 13 lines in 6 files changed: 0 ins; 0 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4176.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4176/head:pull/4176

PR: https://git.openjdk.java.net/jdk/pull/4176