Index: llvm/lib/Passes/PassBuilder.cpp
===================================================================
--- llvm/lib/Passes/PassBuilder.cpp
+++ llvm/lib/Passes/PassBuilder.cpp
@@ -561,6 +561,9 @@
         EnableMSSALoopDependency, DebugLogging));
   }
 
+  if (PTO.Coroutines)
+    FPM.addPass(CoroElidePass());
+
   for (auto &C : ScalarOptimizerLateEPCallbacks)
     C(FPM, Level);
 
@@ -847,10 +850,8 @@
 
   MainCGPipeline.addPass(AttributorCGSCCPass());
 
-  if (PTO.Coroutines) {
+  if (PTO.Coroutines)
     MainCGPipeline.addPass(CoroSplitPass());
-    MainCGPipeline.addPass(createCGSCCToFunctionPassAdaptor(CoroElidePass()));
-  }
 
   // Now deduce any function attributes based in the current code.
   MainCGPipeline.addPass(PostOrderFunctionAttrsPass());
Index: llvm/test/Transforms/Coroutines/ex2.ll
===================================================================
--- llvm/test/Transforms/Coroutines/ex2.ll
+++ llvm/test/Transforms/Coroutines/ex2.ll
@@ -40,8 +40,14 @@
   %hdl = call i8* @f(i32 4)
   call void @llvm.coro.resume(i8* %hdl)
   call void @llvm.coro.resume(i8* %hdl)
+  %to = icmp eq i8* %hdl, null
+  br i1 %to, label %return, label %destroy
+destroy:
   call void @llvm.coro.destroy(i8* %hdl)
+  br label %return
+return:
   ret i32 0
+; CHECK-NOT:  call i8* @CustomAlloc
 ; CHECK:      call void @print(i32 4)
 ; CHECK-NEXT: call void @print(i32 5)
 ; CHECK-NEXT: call void @print(i32 6)
Index: llvm/test/Transforms/Coroutines/ex3.ll
===================================================================
--- llvm/test/Transforms/Coroutines/ex3.ll
+++ llvm/test/Transforms/Coroutines/ex3.ll
@@ -6,11 +6,17 @@
 entry:
   %id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
   %size = call i32 @llvm.coro.size.i32()
+  %need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
+  br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
+dyn.alloc:
   %alloc = call i8* @malloc(i32 %size)
-  %hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %alloc)
+  br label %coro.begin
+coro.begin:
+  %phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ]
+  %hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %phi)
   br label %loop
 loop:
-  %n.val = phi i32 [ %n, %entry ], [ %inc, %loop.resume ]
+  %n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop.resume ]
   call void @print(i32 %n.val) #4
   %0 = call i8 @llvm.coro.suspend(token none, i1 false)
   switch i8 %0, label %suspend [i8 0, label %loop.resume
@@ -37,8 +43,15 @@
   %hdl = call i8* @f(i32 4)
   call void @llvm.coro.resume(i8* %hdl)
   call void @llvm.coro.resume(i8* %hdl)
+  %c = ptrtoint i8* %hdl to i64
+  %to = icmp eq i64 %c, 0
+  br i1 %to, label %return, label %destroy
+destroy:
   call void @llvm.coro.destroy(i8* %hdl)
+  br label %return
+return:
   ret i32 0
+; CHECK-NOT:  i8* @malloc
 ; CHECK:      call void @print(i32 4)
 ; CHECK-NEXT: call void @print(i32 -5)
 ; CHECK-NEXT: call void @print(i32 5)