[Bug 251247] java/openjdk8: add support for powerpc64le

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251247

            Bug ID: 251247
           Summary: java/openjdk8: add support for powerpc64le
           Product: Ports & Packages
           Version: Latest
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: java at FreeBSD.org
          Reporter: pkubaj at FreeBSD.org
                CC: powerpc at FreeBSD.org
          Assignee: java at FreeBSD.org
                CC: powerpc at FreeBSD.org
             Flags: maintainer-feedback?(java at FreeBSD.org)

Created attachment 219802
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=219802&action=edit
patch

powerpc64le needs --disable-jfr and USE_PRECOMPILED_HEADER=0 - same as
powerpc64 elfv2.

Clang refuses to build little-endian binaries for power7, this needs to be
bumped to power8 (this is a bug in openjdk, POWER7 is not LE-compatible).

-minsert-sched-nops=regroup_exact -mno-multiple -mno-string are not supported
by clang and need to be removed.

FreeBSD uses sys/endian.h instead of byteswap.h and bswap{16,32,64} instead of
bswap_{16,32,64}.

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