(ldo/ldil SImode and HImode recognizers): Use "const_int_operand" for operand 1 and simplify final condition.

(ldo/ldil SImode and HImode recognizers): Use "const_int_operand"
for operand 1 and simplify final condition.  Remove `n' constraint.
(depi SImode and HImode recognizers): Remove `n' constraint.
(plus:SI ... high ... splitter): Don't overwrite input, go via
clobber operand instead.
(many patterns): Replace `in' constraint with just `i'.
(movstrsi): Don't do (clobber (match_scratch)), use explicit
pseudos instead, generated in preparation C code.  Don't call
force_not_mem for operand 2.
(movstrsi recognizer): Add `&' to operand 3
(andsi3): Fix typo.
(iorsi3): Fix typo.
(load-shift-16): New optimizer.
(load-shift optimizers): Set "type" attr.

From-SVN: r2232