re PR rtl-optimization/5742 (bug with -freg-struct-return and functions returning...

re PR rtl-optimization/5742 (bug with -freg-struct-return and functions returning 1 byte values)

        PR optimization/5742
        * machmode.def: Add inner mode field to complex modes.
        * config/mips/mips.c (mips_function_value): Always define.  Add
        new argument to handle libcalls.
        * config/mips/mips.h (LIBCALL_VALUE): Use mips_function_value.
        (FUNCTION_VALUE): Likewise.
        * config/mips/abi64.h (FUNCTION_VALUE): Remove.
        * config/mips/mips-protos.h: Update.

From-SVN: r51250