[PATCH] [Sema] Don't warn if taking the absolute value of a difference of unsigned values.

[Charles Davis]

Hi rtrieu,

While any given unsigned value usually cannot be negative, a difference
of two unsigned values can be negative iff the subtrahend (i.e. the
second value) is greater than the minuend. For this reason, it is common
to wrap a difference like this in an abs(3) call. Don't warn on these
cases.

http://reviews.llvm.org/D10263

Files:
  lib/Sema/SemaChecking.cpp
  test/Sema/warn-absolute-value.c
  test/SemaCXX/warn-absolute-value.cpp

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