* gcc.target/x86-64/abi: New directory.
        * gcc.target/x86-64/abi/abi-x86_64.exp: New testsuite.
        * gcc.target/x86-64/abi/README.gcc: New file.
        * gcc.target/x86-64/abi/{args.h,defines.h,macros.h}: New headers.
        * gcc.target/x86-64/abi/asm-support.s: New file.
        * gcc.target/x86_64/abi/test_3_element_struct_and_unions.c: New test.
        * gcc.target/x86_64/abi/test_basic_alignment.c: New test.
        * gcc.target/x86_64/abi/test_basic_array_size_and_align.c: New test.
        * gcc.target/x86_64/abi/test_basic_returning.c: New test.
        * gcc.target/x86_64/abi/test_basic_sizes.c: New test.
        * gcc.target/x86_64/abi/test_basic_struct_size_and_align.c: New test.
        * gcc.target/x86_64/abi/test_basic_union_size_and_align.c: New test.
        * gcc.target/x86_64/abi/test_bitfields.c: New test.
        * gcc.target/x86_64/abi/test_complex_returning.c: New test.
        * gcc.target/x86_64/abi/test_passing_floats.c: New test.
        * gcc.target/x86_64/abi/test_passing_integers.c: New test.
        * gcc.target/x86_64/abi/test_passing_structs_and_unions.c: New test.
        * gcc.target/x86_64/abi/test_passing_structs.c: New test.
        * gcc.target/x86_64/abi/test_passing_unions.c: New test.
        * gcc.target/x86_64/abi/test_struct_returning.c: New test.
        * gcc.target/x86_64/abi/test_varargs.c: New test.

From-SVN: r101249