rx: Rewrite the bit manipulation patterns.

rx: Rewrite the bit manipulation patterns.

The patterns represented with ashift 1 canonically need to have
the ashift as the first operand of the logical operation.

Leave insv represented as a zero_extract store.
Implement a variable store to a 1 bit field as tst+bmne.
Implement a variable store of a condition into a 1 bit field with bmcc.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@168927 138bc75d-0d04-0410-961f-82ee72b054a4