[llvm] [NFC][Coroutines] Remove redundant checks for replacing PrepareFns (PR #98392)

[Chuanqi Xu via llvm-commits]

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@@ -2108,12 +2108,6 @@ PreservedAnalyses CoroSplitPass::run(LazyCallGraph::SCC &C,
   if (Coroutines.empty() && PrepareFns.empty())
     return PreservedAnalyses::all();
 
-  if (Coroutines.empty()) {
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ChuanqiXu9 wrote:

But it reads the PrepareFns, are they the same thing?

https://github.com/llvm/llvm-project/pull/98392