hg: jdk/jdk: 8249607: C2: assert(!had_error) failed: bad dominance

[christian.hagedorn at oracle.com]

Changeset: 05d7a0663063
Author:    chagedorn
Date:      2020-08-31 12:10 +0200
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/05d7a0663063

8249607: C2: assert(!had_error) failed: bad dominance
Summary: Fix prevented igvn optimization in SplitIf for LoadNodes which resulted in dominanance errors with loop strip mining.
Reviewed-by: roland, kvn

! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/loopnode.hpp
! src/hotspot/share/opto/loopopts.cpp
+ test/hotspot/jtreg/compiler/loopopts/TestSplitIfPinnedLoadInStripMinedLoop.java