[llvm] [BOLT] Add sink block to flow CFG in profile inference (PR #95047)

[Amir Ayupov via llvm-commits]

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@@ -595,9 +595,7 @@ bool canApplyInference(const FlowFunction &Func) {
   if (Func.Blocks.size() > opts::StaleMatchingMaxFuncSize)
     return false;
 
-  bool HasExitBlocks = llvm::any_of(
-      Func.Blocks, [&](const FlowBlock &Block) { return Block.isExit(); });
-  if (!HasExitBlocks)
+  if (Func.Blocks[Func.Sink].isEntry())
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aaupov wrote:

Please add a comment what is meant by Sink block returning true for `isEntry`

https://github.com/llvm/llvm-project/pull/95047