[PATCH] First part of arm assembler parser cleanup

[Richard Earnshaw]

This is the first part of the ARM assembler parser cleanup.  It doesn't do
very much dramatic, but it does clean up several of the definitions that
are in use within the assembler: in particular it defines a number of
architectural extensions, and then defines architectures in terms of the
extensions.  Mostly assembler instructions are now defined in terms of the
extension that adds that instruction.

I'd like to get this patch installed and out of the way before I move on to
more substantive changes.

<date>  Richard Earnshaw  (rearnsha@arm.com)

        General cleanup of feature definitions.
        * tc-arm.c (ARM_EXT_LONGMUL, ARM_EXT_HALFWORD, ARM_EXT_THUMB): Delete.
        (ARM_2UP, ARM_ALL, ARM_3UP, ARM_6UP): Delete.
        (FPU_CORE, FPU_FPA10, FPA_FPA11, FPU_ALL, FPA_MEMMULTI): Delete.
        (ARM_EXT_V{1,2,2S,3,3M,4,4T,5T,5ExP}): New defines.
        (ARM_EXT_V{5,5E}): Synchronize with above.
        (ARM_ARCH_V*): Define a complete set in terms of above features.
        (ARM_{1,2,3,250,6,7,8,9,STRONG}): Define in terms of architecture.
        (FPU_FPA_EXT_V[12]): Define.
        (FPU_ARCH_FPE, FPU_ARCH_FPA): Define in terms of above.
        (FPU_ANY): Define.
        (FPU_DEFAULT): Default to FPA.
        (CPU_DEFAULT): For XScale, this is now just ARM_ARCH_XSCALE; for
        Thumb, this is now ARM_ARCH_V5T.
        (insns): Rework for new feature defines.
        (tinsns): Likewise.
        (opcode_select, do_ldst, md_begin, md_parse_option): Likewise.