[llvm] [CodeGen] Support start/stop in CodeGenPassBuilder (PR #70912)

[Arthur Eubanks via llvm-commits]

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@@ -123,6 +124,13 @@ namespace llvm {
 /// all of the built-in passes, and those may reference these members during
 /// construction.
 template <typename DerivedT> class CodeGenPassBuilder {
+  bool runBeforeAdding(StringRef Name) const {
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aeubanks wrote:

can you move this definition somewhere else in the class? it doesn't belong right at the top

https://github.com/llvm/llvm-project/pull/70912