[SH] Improve extu.b, extu.w utilization for andsi3

[Oleg Endo]

Hello,

On SH a logical and with constants 0xFFFF or 0xFF can be done with the
respective zero-extension operations.  The attached patch improves the
utilization of the zero-extension operations a little bit, resulting in
slightly better code.

Tested against rev 189081 with
make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m2a-single/-mb,-m4/-ml,-m4/-mb,
-m4-single/-ml,-m4-single/-mb,-m4a-single/-ml,-m4a-single/-mb}"

and no new failures.

Cheers,
Oleg

ChangeLog:

	* config/sh/predicates.md (logical_and_operand): New predicate.
	* config/sh/constraints.md (Jmb, Jmw): New constraints.
	* config/sh/sh.md (andsi3): Move expander above insns.  Add 
	handling of 0xFFFF constant.  Use logical_and_operand predicate 
	and satisfies_constraint_Jmb, satisfies_constraint_Jmw.
	(*andsi3_compact): Make it an insn_and_split.  Use 
	logical_and_operand predicate.  Add Jmb,Jmw alternatives.
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