[code-reflection] Integrated: Replace class.getName() string compares with class.isAssignableFrom

[Gary Frost]

We wrere using classname string comparisons in multiple places where class.isAssignableFrom() was more appropriate

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Commit messages:
 - Replace class.getName() string comparisons with class.isAssignableFrom...

Changes: https://git.openjdk.org/babylon/pull/866/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=866&range=00
  Stats: 28 lines in 3 files changed: 1 ins; 7 del; 20 mod
  Patch: https://git.openjdk.org/babylon/pull/866.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/866/head:pull/866

PR: https://git.openjdk.org/babylon/pull/866