RFR: 8303963: Replace various encodings of UINT/SIZE_MAX in gc code

[Thomas Schatzl]

Hi all,

  please review this refactoring that replaces various casts in GC more-or-less related to get all bits set in an uint/size_t with the available constants from cstdint.
The ones in ZGC files were skipped on request.

Testing: local compilation, gha

Thanks,
  Thomas

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Commit messages:
 - Initial version

Changes: https://git.openjdk.org/jdk/pull/12973/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12973&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303963
  Stats: 15 lines in 13 files changed: 0 ins; 2 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/12973.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12973/head:pull/12973

PR: https://git.openjdk.org/jdk/pull/12973