[committed] Fix pr21085

[James A. Morrison]

 Hi,

  This bug where TRUNC_MOD_EXPR was trying to simplify X % INT_MIN to
X % INT_MIN where INT_MIN was acheived through overflow.  The reason this
wasn't caught by the sign_bit_p check was that sign_bit_p returns NULL for
expressions that have overflowed.  This patch has been bootstrapped and
regtested on ia64-linux and preapproved by Roger in the PR.

-- 
Thanks,
Jim

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

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