[clang] [llvm] Reimplement constrained 'trunc' using operand bundles (PR #118253)

[Kevin P. Neal via cfe-commits]

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@@ -251,10 +251,12 @@ static bool markTails(Function &F, OptimizationRemarkEmitter *ORE) {
 
       // Special-case operand bundles "clang.arc.attachedcall", "ptrauth", and
       // "kcfi".
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kpneal wrote:

This comment needs to be updated. I suggest removing the list that is present in the code and replacing it with text explaining why these operand bundles are special cases.

https://github.com/llvm/llvm-project/pull/118253