[patch] Fix pr14796

[James A. Morrison]

 Hi,

  This patch adds some transformations for shifts and rotates such as
(a << c1) << c2 to a << (c1+c2).  This patch has been bootstrapped and
regtested on ia64-linux with no new regressions.  Ok for mainline?

-- 
Thanks,
Jim

http://www.csclub.uwaterloo.ca/~ja2morri/
http://phython.blogspot.com
http://open.nit.ca/wiki/?page=jim
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