Hi all, This patch fixes several `int` overflows relating to flat array element loads/stores. I've included some gtests that address a subset of these changes. We should test flat arrays larger than 16GB in size, which is not something we can feasibly do in our tier1 jtreg tests. I've filed [JDK-8372261](https://bugs.openjdk.org/browse/JDK-8372261) as a follow-up RFE to investigate this.
Testing: tiers 1-4, [`LocalityCheck.java`](https://bugs.openjdk.org/secure/attachment/117136/LocalityCheck.java) run locally 100 times. ------------- Commit messages: - Fix up tests. - Include test case. - Fix another overflow. - Use ptrdiff_t in value_at_addr. Changes: https://git.openjdk.org/valhalla/pull/1752/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1752&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8371604 Stats: 74 lines in 4 files changed: 69 ins; 0 del; 5 mod Patch: https://git.openjdk.org/valhalla/pull/1752.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1752/head:pull/1752 PR: https://git.openjdk.org/valhalla/pull/1752
