[llvm] [CodeGen][NewPM] Port LiveDebugVariables to NPM (PR #115468)

[Akshat Oke via llvm-commits]

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@@ -1341,7 +1339,7 @@ bool LiveDebugVariables::invalidate(
   // Some architectures split the register allocation into multiple phases based
   // on register classes. This requires preserving analyses between the phases
   // by default.
-  return PAC.preservedWhenStateless();
+  return !PAC.preservedWhenStateless();
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optimisan wrote:

All passes are preserving this analysis and VirtRegRewriter will abandon this if it's the final one in the pipeline (`ClearVirtRegs = true`)

https://github.com/llvm/llvm-project/pull/115468