RFR: 8329750: Change Universe functions to return more specific Klass* types

[Stefan Karlsson]

We have various functions in Universe that returns Klass* where they could be returning TypeArrayKlass* and ObjArrayKlass* instead. If we change these functions we could get rid of some casts in the code. Does this seem like a reasonable change?

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Commit messages:
 - 8329750: Change Universe functions to return more specific Klass* types

Changes: https://git.openjdk.org/jdk/pull/18652/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18652&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329750
  Stats: 43 lines in 6 files changed: 2 ins; 7 del; 34 mod
  Patch: https://git.openjdk.org/jdk/pull/18652.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18652/head:pull/18652

PR: https://git.openjdk.org/jdk/pull/18652