[PATCH] InstCombine: merge constants in both operands of icmp.

[Erik Verbruggen]

[PATCH] InstCombine: merge constants in both operands of icmp.

E.g.: x + 10 < 0 --> x < -10 (if add has nsw)
      x - 10 < 0 --> x < 10 (if sub has nsw)


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