[LLVMdev] [PATH] Add sub.ovf/mul.ovf intrinsics

[Zoltan Varga]

Hi,

The attached patch implements sub.ovf/mul.ovf intrinsics similarly to
the recently added add.ovf intrinsics. These are useful for
implementing some vm instructions like sub.ovf/mul.ovf in .NET IL
efficiently.  sub.ovf is supported in target independent lowering and
on x86, while mul.ovf is only supported in the x86 backend.

                                        Please review

                                                    Zoltan
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