re PR target/19019 (GCC ldouble format incompatibility with XLC long double)

re PR target/19019 (GCC ldouble format incompatibility with XLC long double)

        PR target/19019
        * config/rs6000/darwin-ldouble.c (_xlqadd): Rename to __gcc_qadd.
        (_xlqsub): Rename to __gcc_qsub.
        (_xlqmul): Rename to __gcc_qmul.
        (_xlqdiv): Rename to __gcc_qdiv.
        Provide versioned symbol aliases with old names.
        * config/rs6000/libgcc-ppc64.ver: Rename symbols.
        * config/rs6000/rs6000.c (rs6000_init_libfuncs): Rename symbols.
        * config/rs6000/t-aix43 (LIB2FUNCS_EXTRA): New.
        * config/rs6000/t-aix52 (LIB2FUNCS_EXTRA): New.
        * config/rs6000/t-newas (LIB2FUNCS_EXTRA): New.

From-SVN: r95079