mn10300/AM33: Simplify movqi patterns

[Alexandre Oliva]

The simplifications of the AM33 movqi pattern gets us consistent space
savings (compared with the previous am33 patch).  The ones in the
mn10300 pattern doesn't introduce any changes, but I believe it's
worth it just for the sake of simplification.  Ok to install?

v mn10300-elf/am33/libiberty/libiberty.a 28278 28240
v mn10300-elf/am33/libio/libio.a 23725 23690
v mn10300-elf/am33/libio/libiostream.a 64987 64949
v mn10300-elf/am33/libstdc++/libstdc++.a 70825 70787
v mn10300-elf/am33/newlib/libc.a 47673 47631
v mn10300-elf/am33/newlib/libc/libc.a 46226 46184
v mn10300-elf/am33/newlib/libc/machine/lib.a 773 769
v mn10300-elf/am33/newlib/libc/machine/mn10300/lib.a 773 769
v mn10300-elf/am33/newlib/libc/stdio/lib.a 16986 16976
v mn10300-elf/am33/newlib/libc/stdlib/lib.a 20363 20345
v mn10300-elf/am33/newlib/libc/string/lib.a 3038 3028
v mn10300-elf/am33/newlib/libg.a 47673 47631