RFR: 8267303: Replace MinObjectAlignmentSize usages for non-Java heap objects

[Coleen Phillimore]

Replace '3' and LogMinObjAlignmentInBytes with LogBytesPerWord (3 for LP64 and 2 for 32 bits).
Hoping git actions will test 32 bits.
Tested with tier1 on all Oracle platforms, but since I didn't change the values for our platforms, no failures expected.

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Commit messages:
 - 8267303: Replace MinObjectAlignmentSize usages for non-Java heap objects

Changes: https://git.openjdk.java.net/jdk/pull/4675/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4675&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267303
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4675.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4675/head:pull/4675

PR: https://git.openjdk.java.net/jdk/pull/4675