Add support for patterns that have physical registers in them.  Testcase:
Add support for patterns that have physical registers in them.  Testcase:

def : Pat<(trunc G8RC:$in),
          (OR8To4 G8RC:$in, X0)>;

Even though this doesn't make any sense on PPC :)


git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@23815 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx