hg: jdk/sandbox: 8210389: C2: assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc

[chris.hegarty at oracle.com]

Changeset: 4cffba2df537
Author:    roland
Date:      2018-09-18 20:41 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/4cffba2df537

8210389: C2: assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
Reviewed-by: kvn, thartmann

! src/hotspot/share/opto/compile.cpp
+ test/hotspot/jtreg/compiler/regalloc/VolatileLoadMemBarsOnlyUses.java