(zero_extendqihi2): Taken out, let GCC synthesize.
(movhi-1): Added insn to move HImode small constant to memory.
(movhf-1): Added insn to move HFmode zero to memory.
(movtqf-1): Added insn to move TQFmode zero to memory.
(numerous insns): Taken out B (Base Reg with Index) mode.

From-SVN: r11199