[llvm] [CodeGen] IMPLICIT_DEF must not contribute to Weight in LICM register cost computation (PR #196500)

[via llvm-commits]

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@@ -969,6 +969,11 @@ MachineLICMImpl::calcRegisterCost(const MachineInstr *MI, bool ConsiderSeen,
     if (MO.isDef())
       RCCost = W.RegWeight;
     else {
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pratikashar wrote:

@arsenm - Does this explanation clarify the intent of this patch?

https://github.com/llvm/llvm-project/pull/196500