hg: jdk/sandbox: 8218965: aix: support xlclang++ in the compiler detection

[chris.hegarty at oracle.com]

Changeset: b3f6ffbedd68
Author:    mbaesken
Date:      2019-02-19 09:02 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/b3f6ffbedd68

8218965: aix: support xlclang++ in the compiler detection
Reviewed-by: ihse, mdoerr

! make/autoconf/flags-cflags.m4
! make/autoconf/toolchain.m4
! src/java.desktop/share/native/libfontmanager/harfbuzz/hb-atomic-private.hh