[13] RFR(T): 8229219: C2 compilation fails with assert: Bad graph detected in build_loop_late

[Tobias Hartmann]

Hi,

please review the following patch that backs out the fix for JDK-8173196 [1] due to intermittent C2
crashes in loopopts with a JCK test (details are in the bug comments):
https://bugs.openjdk.java.net/browse/JDK-8229219
http://cr.openjdk.java.net/~thartmann/8229219/webrev.00/

I'll file a REDO enhancement for JDK 14 once this is in.

Thanks,
Tobias

[1] http://hg.openjdk.java.net/jdk/jdk/rev/9691a169f1dd