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

[via llvm-commits]

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@@ -1035,34 +1243,35 @@ void CodeGenPassBuilder<Derived>::addRegAllocPass(AddMachinePass &addPass,
 }
 
 template <typename Derived>
-Error CodeGenPassBuilder<Derived>::addRegAssignmentFast(
+Error CodeGenPassBuilder<Derived>::addRegAssignAndRewriteFast(
     AddMachinePass &addPass) const {
   if (Opt.RegAlloc != RegAllocType::Default &&
       Opt.RegAlloc != RegAllocType::Fast)
     return make_error<StringError>(
         "Must use fast (default) register allocator for unoptimized regalloc.",
         inconvertibleErrorCode());
 
-  addRegAllocPass(addPass, false);
-  return Error::success();
+  addPass(RegAllocPass(false));
+
+  // Allow targets to change the register assignments after
+  // fast register allocation.
+  return derived().addPostFastRegAllocRewrite(addPass);
 }
 
-template <typename Derived>
-Error CodeGenPassBuilder<Derived>::addRegAssignmentOptimized(
+template <typename DerivedT>
+Error llvm::CodeGenPassBuilder<DerivedT>::addRegAssignAndRewriteOptimized(
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paperchalice wrote:

Done

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