[jdk8u-dev] RFR: 8202952: C2: Unexpected dead nodes after matching [v3]

[Dongbo He]

> I would like to backport this patch to fix crash during C2 compilation. 
> 
> This patch doesn't apply cleanly due to context differences, and
> I selected fuzzer tests from Fei Yang because the tests in the original commit cannot be reproduced on JDK8u.
> 
> Performed hotspot jtreg test on linux x86-64 platforms with -Xcomp options, new test fails without product change and passes with it.

Dongbo He has updated the pull request incrementally with one additional commit since the last revision:

  use X86_ONLY(LP64_ONLY(x)) instead of LP64_ONLY

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

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/291/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/291/files/b86159a7..575aa534

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=291&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=291&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/291.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/291/head:pull/291

PR: https://git.openjdk.org/jdk8u-dev/pull/291