Cleanup the logical DImode operations since the current implementation is way
too complicated.  Thumb-1, Thumb-2, VFP/Neon and iwMMXt all work differently,
resulting in a bewildering number of expansions, patterns and splits across
several md files.  All this complexity is counterproductive and results in
inefficient code.

A much simpler approach is to split these operations early in the expander
so that optimizations and register allocation are applied on the 32-bit halves.
Codegeneration is unchanged on Thumb-1 and Arm/Thumb-2 without Neon or iwMMXt
(which already expand these instructions early).  With Neon these changes save
~1000 instructions from the PR77308 testcase, mostly by significantly reducing
register pressure and spilling.

Bootstrap OK on arm-none-linux-gnueabihf --with-cpu=cortex-a57

    gcc/
	* config/arm/arm.md (split and/eor/ior): Remove Neon check.
	(split not): Add DImode not splitter.
	(anddi3): Remove pattern.
	(anddi3_insn): Likewise.
	(anddi_zesidi_di): Likewise.
	(anddi_sesdi_di): Likewise.
	(anddi_notdi_di): Likewise.
	(anddi_notzesidi_di): Likewise.
	(anddi_notsesidi_di): Likewise.
	(iordi3): Likewise.
	(iordi3_insn): Likewise.
	(iordi_zesidi_di): Likewise.
	(iordi_sesidi_di): Likewise.
	(xordi3): Likewise.
	(xordi3_insn): Likewise.
	(xordi_sesidi_di): Likewise.
	(xordi_zesidi_di): Likewise.
	(one_cmpldi2): Likewise.
	(one_cmpldi2_insn): Likewise.
	* config/arm/constraints.md: Remove De, Df, Dg constraints.
	* config/arm/iwmmxt.md (iwmmxt_iordi3): Remove general register
	alternative.
	(iwmmxt_xordi3): Likewise.
	(iwmmxt_anddi3): Likewise.
	* config/arm/neon.md (orndi3_neon): Remove pattern.
	(anddi_notdi_di): Likewise.
	* config/arm/predicates.md (arm_anddi_operand_neon): Remove.
	(arm_iordi_operand_neon): Likewise.
	(arm_xordi_operand_neon): Likewise.
	* config/arm/thumb2.md(iordi_notdi_di): Remove pattern.
	(iordi_notzesidi_di): Likewise.
	(iordi_notdi_zesidi): Likewise.
	(iordi_notsesidi_di): Likewise.

From-SVN: r274823