[LLVMdev] DeadStoreElimination: do better without TargetData

[Hans Wennborg]

Re-posting with better-looking code.

Hans Wennborg wrote:
> The attached patch makes DeadStoreElimination able to remove stores in 
> store-store dependencies when the operand types are equal, even if there 
> is no TargetData available.
> 
> / Hans
> 
> 
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