RFR: 8267213: assert(left >= right) failed: avoid underflow [v4]

[Jie Fu]

> Hi all,
> 
> This is a follow-up of JDK-8260046.
> And it can be reproduced by `java -XX:UnguardOnExecutionViolation=1` on x86_32.
> Let's fix it
> 
> Thanks.
> Best regards,
> Jie

Jie Fu has updated the pull request incrementally with one additional commit since the last revision:

  cpuinfo_segv should not be triaged as execution protection violation

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4044/files
  - new: https://git.openjdk.java.net/jdk/pull/4044/files/812f3c5a..f3d85e54

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4044&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4044&range=02-03

  Stats: 5 lines in 3 files changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4044.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4044/head:pull/4044

PR: https://git.openjdk.java.net/jdk/pull/4044