RFR: 8310577: Fix -Wconversion warnings in interpreter and oops [v2]

[Coleen Phillimore]

> Please review this change that's mostly casts and a few int type narrowing changes.  The casts are for size calculations between two addresses within the same area so can be int and are never going to be 64 bit.
> I didn't change CompileThreshold to be 'int' because SA and JVMCI code expects it to be intx.  Maybe that should change though.
> Tested with tier1 on Oracle platforms, and tier1-4 linux and windows x64.

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

  Fred's suggestion.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14604/files
  - new: https://git.openjdk.org/jdk/pull/14604/files/ac2fd4bc..c664b3e6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14604&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14604&range=00-01

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/14604.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14604/head:pull/14604

PR: https://git.openjdk.org/jdk/pull/14604