Expose the LowerHopToActorPass as API so LLDB can schedule it

include/swift/SILOptimizer/PassManager/PassPipeline.def

@@ -23,6 +23,7 @@
 #endif
 
 PASSPIPELINE(Diagnostic, "Guaranteed Passes")
+PASSPIPELINE(LowerHopToActor, "Lower Hop to Actor")
 PASSPIPELINE(OwnershipEliminator, "Utility pass to just run the ownership eliminator pass")
 PASSPIPELINE(Performance, "Passes run at -O")
 PASSPIPELINE(Onone, "Passes run at -Onone")

include/swift/SILOptimizer/PassManager/Passes.h

@@ -39,7 +39,10 @@ namespace swift {
   /// Run all SIL passes for -Onone on module \p M.
   void runSILPassesForOnone(SILModule &M);
 
-  /// Run the SIL ownership eliminator pass on \p M.
+  /// Run the SIL lower hop-to-actor pass on \p M.
+  bool runSILLowerHopToActorPass(SILModule &M);
+
+/// Run the SIL ownership eliminator pass on \p M.
   bool runSILOwnershipEliminatorPass(SILModule &M);
 
   void runSILOptimizationPassesWithFileSpecification(SILModule &Module,

lib/SILOptimizer/PassManager/PassPipeline.cpp

@@ -185,6 +185,14 @@ SILPassPipelinePlan::getDiagnosticPassPipeline(const SILOptions &Options) {
   return P;
 }
 
+SILPassPipelinePlan SILPassPipelinePlan::getLowerHopToActorPassPipeline(
+    const SILOptions &Options) {
+  SILPassPipelinePlan P(Options);
+  P.startPipeline("Lower Hop to Actor");
+  P.addLowerHopToActor();
+  return P;
+}
+
 //===----------------------------------------------------------------------===//
 //                       Ownership Eliminator Pipeline
 //===----------------------------------------------------------------------===//

lib/SILOptimizer/PassManager/Passes.cpp

@@ -74,6 +74,16 @@ bool swift::runSILDiagnosticPasses(SILModule &Module) {
   return Ctx.hadError();
 }
 
+bool swift::runSILLowerHopToActorPass(SILModule &Module) {
+  auto &Ctx = Module.getASTContext();
+
+  auto &opts = Module.getOptions();
+  executePassPipelinePlan(
+      &Module, SILPassPipelinePlan::getLowerHopToActorPassPipeline(opts));
+
+  return Ctx.hadError();
+}
+
 bool swift::runSILOwnershipEliminatorPass(SILModule &Module) {
   auto &Ctx = Module.getASTContext();