hg: jdk-updates/jdk15u: 3 new changesets

[vkempik at azul.com]

Changeset: fe1cf8f2cf1b
Author:    vkempik
Date:      2020-06-23 13:41 +0300
URL:       https://hg.openjdk.java.net/jdk-updates/jdk15u/rev/fe1cf8f2cf1b

8243470: [macos] bring back O2 opt level for unsafe.cpp
Summary: Remove special case for unsafe.cpp on clang macos
Reviewed-by: erikj, ihse

! make/hotspot/lib/JvmOverrideFiles.gmk

Changeset: 28303ad74c18
Author:    vkempik
Date:      2020-07-02 20:33 +0300
URL:       https://hg.openjdk.java.net/jdk-updates/jdk15u/rev/28303ad74c18

8248495: [macos] zerovm is broken due to libffi headers location
Reviewed-by: ihse, erikj

! make/autoconf/lib-ffi.m4

Changeset: 18221a14832b
Author:    vkempik
Date:      2020-08-10 22:42 +0300
URL:       https://hg.openjdk.java.net/jdk-updates/jdk15u/rev/18221a14832b

8250876: Fix issues with cross-compile on macos
Reviewed-by: erikj, ihse

! make/autoconf/flags.m4
! make/autoconf/toolchain.m4