[patch,committed,v6] Backport PR75964

[Georg-Johann Lay]

...also backported to gcc-6-branch:

https://gcc.gnu.org/r250511

Johann

gcc/
      Backport from 2017-05-06 trunk r247719.
      PR rtl-optimization/75964
      * simplify-rtx.c (simplify_const_relational_operation): Remove
      invalid handling of comparisons of integer ABS.

gcc/testsuite/
      Backport from 2017-05-06 trunk r247719.
      PR rtl-optimization/75964
      * gcc.dg/torture/pr75964.c: New test.
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