[llvm] [coro][pgo] Don't promote pgo counters in the suspend basic block (PR #71263)

[David Li via llvm-commits]

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@@ -242,8 +242,16 @@ class PGOCounterPromoter {
     if (!isPromotionPossible(&L, LoopExitBlocks))
       return;
 
+    auto IsSuspendBB = [&](BasicBlock *BB) {
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david-xl wrote:

can this be a common utility function somewhere such as BasicBlockUtils.h?

https://github.com/llvm/llvm-project/pull/71263