RFR: 8324121: SIGFPE in PhaseIdealLoop::extract_long_range_checks [v2]

[Roland Westrelin]

> Both failures occur because `ABS(scale * stride_con)` overflows (scale
> a really large long number). I reworked the test so overflow is no
> longer an issue.

Roland Westrelin has updated the pull request incrementally with one additional commit since the last revision:

  review

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18397/files
  - new: https://git.openjdk.org/jdk/pull/18397/files/6890e385..d4cddf82

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18397&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18397&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18397.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18397/head:pull/18397

PR: https://git.openjdk.org/jdk/pull/18397