RFR: 8308396: Fix offset_of conversion warnings in runtime code [v2]

[Coleen Phillimore]

> Please review this change to use ByteSize and byte_offset_of() to refer to offsets to metadata and other types that are used in generated code.  This avoids the int narrowing conversion warning for -Wconversion.  There were a couple that I just added an (int) cast instead because these offsets are either being used in other code currently being changed (in oopDesc) or there are too many (like displaced_header_offset_in_bytes) and should be their own change.
> 
> This change takes a  chunk out of the -Wconversion warnings - see CR for more info.
> 
> It might be easier and less tedious to review the commits separately.  One commit renames blah_offset_in_bytes to blah_offset, since in_bytes(blah_offset()) is typically used (except in Address constructor which has an overload for ByteSize).
> 
> Tested with tier1-4, x86 and aarch64, and built linux-x64-zero linux-x64-zero-debug linux-aarch64-debug linux-s390x-open linux-arm32-debug linux-ppc64le-debug linux-riscv64-debug locally.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Fix s390

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14053/files
  - new: https://git.openjdk.org/jdk/pull/14053/files/56f2b4ba..f629ebce

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14053&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14053&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14053.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14053/head:pull/14053

PR: https://git.openjdk.org/jdk/pull/14053