hg: jdk/submit: 8224658: Unsafe access C2 compile fails with assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr: adr_type = NULL

[tobias.hartmann at oracle.com]

Changeset: c63b9b87c28a
Author:    thartmann
Date:      2019-06-12 14:06 +0200
URL:       http://hg.openjdk.java.net/jdk/submit/rev/c63b9b87c28a

8224658: Unsafe access C2 compile fails with assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr: adr_type = NULL
Summary: Handle unsafe off-heap access with constant zero address.
Reviewed-by: vlivanov, roland

! src/hotspot/share/opto/graphKit.hpp
! src/hotspot/share/opto/library_call.cpp
! src/hotspot/share/opto/memnode.cpp
! src/hotspot/share/opto/output.cpp
+ test/hotspot/jtreg/compiler/unsafe/TestUnsafeLoadWithZeroAddress.java