hg: jdk/submit: 8245158: C2: Enable SLP for some manually unrolled loops

[pengfei.li at arm.com]

Changeset: 59d461fd568e
Author:    pli
Date:      2020-06-02 01:38 +0000
URL:       https://hg.openjdk.java.net/jdk/submit/rev/59d461fd568e

8245158: C2: Enable SLP for some manually unrolled loops
Summary: In SuperWord::find_align_to_ref(), only discard unalignable memory ops if memory references should be aligned on this platform.
Reviewed-by: roland, thartmann

! src/hotspot/share/opto/superword.cpp
! src/hotspot/share/opto/superword.hpp