rs6000.c (expand_block_move): Add 64-bit PowerPC doubleword move to STRING case.

rs6000.c (expand_block_move): Add 64-bit PowerPC doubleword move to STRING case.

        * rs6000.c (expand_block_move): Add 64-bit PowerPC doubleword move
        to STRING case.  Use doubleword STRING move for TARGET_POWERPC64
        when unaligned.
        * rs6000.h (CONST_OK_FOR_LETTER_P, 'J'): unsigned HOST_WIDE_INT.
        (RETURN_ADDR_RTX): Use COUNT and FRAME, not count and frame.
        (LEGITIMIZE_RELOAD_ADDRESS): unsigned HOST_WIDE_INT high.
        * rs6000.md: Name various internal patterns.

From-SVN: r34174