[NFC][Pipelines] Extract buildCoroConditionalWrapper (llvm#126860)

Helper for llvm#126168.

`Phase` will be used in followup patches.

Author: vitalybuka

llvm/lib/Passes/PassBuilderPipelines.cpp

@@ -410,6 +410,19 @@ static bool isLTOPreLink(ThinOrFullLTOPhase Phase) {
          Phase == ThinOrFullLTOPhase::FullLTOPreLink;
 }
 
+// Helper to wrap conditionally Coro passes.
+static CoroConditionalWrapper buildCoroWrapper(ThinOrFullLTOPhase Phase) {
+  // TODO: Skip passes according to Phase.
+  ModulePassManager CoroPM;
+  CoroPM.addPass(CoroEarlyPass());
+  CGSCCPassManager CGPM;
+  CGPM.addPass(CoroSplitPass());
+  CoroPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(std::move(CGPM)));
+  CoroPM.addPass(CoroCleanupPass());
+  CoroPM.addPass(GlobalDCEPass());
+  return CoroConditionalWrapper(std::move(CoroPM));
+}
+
 // TODO: Investigate the cost/benefit of tail call elimination on debugging.
 FunctionPassManager
 PassBuilder::buildO1FunctionSimplificationPipeline(OptimizationLevel Level,
@@ -2250,14 +2263,7 @@ PassBuilder::buildO0DefaultPipeline(OptimizationLevel Level,
       MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
   }
 
-  ModulePassManager CoroPM;
-  CoroPM.addPass(CoroEarlyPass());
-  CGSCCPassManager CGPM;
-  CGPM.addPass(CoroSplitPass());
-  CoroPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(std::move(CGPM)));
-  CoroPM.addPass(CoroCleanupPass());
-  CoroPM.addPass(GlobalDCEPass());
-  MPM.addPass(CoroConditionalWrapper(std::move(CoroPM)));
+  MPM.addPass(buildCoroWrapper(Phase));
 
   invokeOptimizerLastEPCallbacks(MPM, Level, Phase);