[llvm] [DebugInfo][RemoveDIs] Don't allocate one DPMarker per instruction (PR #79345)

[Stephen Tozer via llvm-commits]

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@@ -882,16 +886,15 @@ void BasicBlock::spliceDebugInfo(BasicBlock::iterator Dest, BasicBlock *Src,
     }
 
     if (First->hasDbgValues()) {
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SLTozer wrote:

Can't this whole if/else block be replaced by just `adoptDbgValues`?

https://github.com/llvm/llvm-project/pull/79345