[PATCH] Unify the way we report overflow in increment/decrement operator.

[Alexey Samsonov]

Hi rsmith,

Make sure signed overflow in "x--" is checked with
llvm.ssub.with.overflow intrinsic and is reported as:
  "-2147483648 - 1 cannot be represented in type 'int'"
instead of:
  "-2147483648 + -1 cannot be represented in type 'int'"
, like we do for unsigned overflow.

http://reviews.llvm.org/D8236

Files:
  lib/CodeGen/CGExprScalar.cpp
  test/CodeGen/integer-overflow.c

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