[llvm] [SimplifyCFG][PGO] Reuse existing `setBranchWeights` (PR #160629)

[Mingming Liu via llvm-commits]

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@@ -672,7 +672,7 @@ CallBase &llvm::pgo::promoteIndirectCall(CallBase &CB, Function *DirectCallee,
       createBranchWeights(CB.getContext(), Count, TotalCount - Count));
 
   if (AttachProfToDirectCall)
-    setBranchWeights(NewInst, {static_cast<uint32_t>(Count)},
+    setBranchWeights(NewInst, ArrayRef<uint32_t>{static_cast<uint32_t>(Count)},
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mingmingl-llvm wrote:

This is a nice catch. AFAIK branch weights on direct calls are used by SampleFDO (not InstrFDO), and fitting it (using `fitWeights`) rather than truncating it should improve the profile quality.

https://github.com/llvm/llvm-project/pull/160629