RFR: 8267303: Replace MinObjectAlignmentSize usages for non-Java heap objects [v2]

[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.

Coleen Phillimore has updated the pull request incrementally with two additional commits since the last revision:

 - missed Symbol.java part of the change.
 - Add equivalent change to SA.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4675/files
  - new: https://git.openjdk.java.net/jdk/pull/4675/files/acc23f38..02ccd486

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4675&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4675&range=00-01

  Stats: 8 lines in 2 files changed: 6 ins; 0 del; 2 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