[SILOpt] Run SSADestroyHoisting in mandatory pipeline.

Run SSADestroyHoisting in the pipeline where DestroyHoisting was
previously running.  Avoid extra ARC traffic that having no form of
destroy hoisting in the mandatory pipeline results in.

rdar://90495704

Author: nate-chandler

lib/SILOptimizer/PassManager/PassPipeline.cpp

@@ -176,8 +176,12 @@ static void addMandatoryDiagnosticOptPipeline(SILPassPipelinePlan &P) {
     P.addSILSkippingChecker();
 #endif
 
-  if (Options.shouldOptimize() && EnableDestroyHoisting) {
-    P.addDestroyHoisting();
+  if (Options.shouldOptimize()) {
+    if (EnableDestroyHoisting) {
+      P.addDestroyHoisting();
+    } else {
+      P.addSSADestroyHoisting();
+    }
   }
   P.addMandatoryInlining();
   P.addMandatorySILLinker();