[PATCH] InstCombine: Recognize an unsigned mul with overflow idiom into umul.

[Erik Verbruggen]

[PATCH] InstCombine: Recognize an unsigned mul with overflow idiom into umul.

    (a*b) <u a  --> llvm.umul.with.overflow.
    (a*b) <u b  --> llvm.umul.with.overflow.
    a >u (a*b)  --> llvm.umul.with.overflow.
    b >u (a*b)  --> llvm.umul.with.overflow.

This resolves a README entry and technically resolves PR4917.

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