[SILOptimizer] Remove DestroyHoisting pass.

It's no longer used.

Author: nate-chandler

include/swift/SILOptimizer/PassManager/Passes.def

@@ -184,8 +184,6 @@ PASS(DeadObjectElimination, "deadobject-elim",
      "Dead Object Elimination for Classes with Trivial Destruction")
 PASS(DefiniteInitialization, "definite-init",
      "Definite Initialization for Diagnostics")
-PASS(DestroyHoisting, "destroy-hoisting",
-     "Hoisting of value destroys")
 PASS(DestroyAddrHoisting, "destroy-addr-hoisting",
      "Hoist destroy_addr for uniquely identified values")
 PASS(Devirtualizer, "devirtualizer",

lib/SILOptimizer/PassManager/PassPipeline.cpp

@@ -61,13 +61,9 @@ static llvm::cl::opt<bool> SILViewSILGenCFG(
     "sil-view-silgen-cfg", llvm::cl::init(false),
     llvm::cl::desc("Enable the sil cfg viewer pass before diagnostics"));
 
-llvm::cl::opt<bool>
-    EnableDestroyHoisting("enable-destroy-hoisting", llvm::cl::init(false),
-                          llvm::cl::desc("Enable the DestroyHoisting pass."));
-
-llvm::cl::opt<bool>
-    EnableDeinitDevirtualizer("enable-deinit-devirtualizer", llvm::cl::init(false),
-                          llvm::cl::desc("Enable the DestroyHoisting pass."));
+llvm::cl::opt<bool> EnableDeinitDevirtualizer(
+    "enable-deinit-devirtualizer", llvm::cl::init(false),
+    llvm::cl::desc("Enable the DeinitDevirtualizer pass."));
 
 // Temporary flag until the stdlib builds with ~Escapable
 llvm::cl::opt<bool>
@@ -218,9 +214,7 @@ static void addMandatoryDiagnosticOptPipeline(SILPassPipelinePlan &P) {
 #endif
 
   if (Options.shouldOptimize()) {
-    if (EnableDestroyHoisting) {
-      P.addDestroyHoisting();
-    } else if (P.getOptions().DestroyHoisting == DestroyHoistingOption::On) {
+    if (P.getOptions().DestroyHoisting == DestroyHoistingOption::On) {
       P.addDestroyAddrHoisting();
     }
   }

lib/SILOptimizer/Transforms/CMakeLists.txt

@@ -14,7 +14,6 @@ target_sources(swiftSILOptimizer PRIVATE
   CopyPropagation.cpp
   DeadCodeElimination.cpp
   DeadObjectElimination.cpp
-  DestroyHoisting.cpp
   Devirtualizer.cpp
   DifferentiabilityWitnessDevirtualizer.cpp
   EagerSpecializer.cpp