Request for review (M): 7029017 Additional architecture support for c2 compiler

[Roland Westrelin]

Hi Vladimir,

> Did you consider to use Matcher property instead of new flag and new ideal node
> code? See how we do Matcher::clone_shift_expressions.

I would like the extra and operations to be optimized out when possible. That won't happen if I do the work at the matcher level, right?

Roland.