[tuples] adding gimple_asm

[Christopher Matthews]

This patch adds support to the gimplifier for asm statements.

    * gimplify.c (gimplify_asm_expr): Created new gimple tuple.
    * gimple-pretty-printer.c (dump_gimple_asm): Added function to dump a
    GIMPLE_ASM statement.
    (dump_gimple_stmt): Updated to use the dump_gimple_asm function.
    * gimple.c (gss_for_code): Made asm statements return as with_mem_ops.
    (build_gimple_with_ops): Asm statements are added as a specal case for
    allocation because they have extra fields that are not allocated correctly
    in the current generic op allocator.
    (build_gimple_asm_1): Added a helper function to setup the basics of a
    GIMPLE_ASM tuple.
    (build_gimple_asm_vec): Create a GIMPLE_ASM tuple from vector arguments.
    (build_gimple_asm): Changed to call the new helper function.
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