[llvm] r280783 - Remove unnecessary call to getAllocatableRegClass

[Krzysztof Parzyszek via llvm-commits]

On 9/30/2016 1:46 PM, Justin Bogner via llvm-commits wrote:
> The assert I'm seeing is in the case where `OpRC != nullptr` but
> `ConstrainedRC == nullptr`. Quentin's suggestion would call
> getAllocatableClass(DstRC) in this case, whereas in the committed code
> we just go ahead and do MRI->createVirtualRegister(OpRC). The call to
> createVirtualRegister asserts because OpRC isn't allocatable.

This doesn't sound right. This implies that a register was created for 
the operand that is not compatible with the operand's class. Sounds like 
the problem is somewhere else.

-Krzysztof

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