[Bug target/66049] [6 regression] Few AArch64 extend and add with shift tests generates sub optimal code with trunk gcc 6.0.

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66049

--- Comment #8 from ktkachov at gcc dot gnu.org ---
(In reply to vekumar from comment #7)

> 
> I am going to first send out patch for adding new shift based patterns.
> Then separate patch test  and remove mul patterns.

Ok, please send out the patch that fixes the regressions we have, and the
cleanup/removal of redundant patterns (if needed) can come later.