[patch] Fix two ABS_EXPR regressions

[James A. Morrison]

Hi,

 This patch fixes two regressions with ABS_EXPRs and wrapv from 3.4.
Bootstrapped and regtested on ia64-linux with no new regressions.  The two
new tests pass now.  The first testcase used to fail with a tree check when
flag_wrapv was specified, the second removed the >= 0 check even though
ABS_EXPR<INT_MIN> = INT_MIN with flag_wrapv.  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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