[llvm] [NewPM][CodeGen] add TargetPassConfig like API (PR #70906)

[via llvm-commits]

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@@ -1105,7 +1305,8 @@ void CodeGenPassBuilder<Derived>::addOptimizedRegAlloc(
   // PreRA instruction scheduling.
   addPass(MachineSchedulerPass());
 
-  if (derived().addRegAssignmentOptimized(addPass)) {
+  Error Err = derived().addRegAssignAndRewriteOptimized(addPass);
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paperchalice wrote:

Propagate error correctly now.

https://github.com/llvm/llvm-project/pull/70906