Avoid overflow when calculating the number of pages for large mapped segment sizes.
------------- Commit messages: - Test update - Initial changes Changes: https://git.openjdk.java.net/jdk/pull/3378/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3378&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8264827 Stats: 32 lines in 5 files changed: 19 ins; 0 del; 13 mod Patch: https://git.openjdk.java.net/jdk/pull/3378.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/3378/head:pull/3378 PR: https://git.openjdk.java.net/jdk/pull/3378
