hg: jdk/submit: 8233820: Test crashed with assert(phi->operand_count() != 1 || phi->subst() != phi) failed: missed trivial simplification

[martin.doerr at sap.com]

Changeset: 48e5a8cd10c0
Author:    mdoerr
Date:      2019-11-12 15:06 +0100
URL:       https://hg.openjdk.java.net/jdk/submit/rev/48e5a8cd10c0

8233820: Test crashed with assert(phi->operand_count() != 1 || phi->subst() != phi) failed: missed trivial simplification
Summary: Verification code needs to skip illegal phi functions.
Reviewed-by: thartmann, vlivanov

! src/hotspot/share/c1/c1_GraphBuilder.cpp
! src/hotspot/share/c1/c1_Optimizer.cpp