hg: jdk/sandbox: 8229016: C2 scalarization crashes with assert(node->Opcode() == Op_CastP2X) failed: ConvP2XNode required

[chris.hegarty at oracle.com]

Changeset: 1d2ea8db7083
Author:    thartmann
Date:      2019-08-07 12:09 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/1d2ea8db7083

8229016: C2 scalarization crashes with assert(node->Opcode() == Op_CastP2X) failed: ConvP2XNode required
Summary: Detect array copy to self to avoid emitting another load to the to-be-removed allocation.
Reviewed-by: kvn

! src/hotspot/share/opto/macro.cpp
+ test/hotspot/jtreg/compiler/escapeAnalysis/TestSelfArrayCopy.java