[llvm] Reland "[LTO] Run Argument Promotion before IPSCCP" (PR #111853)

[Nikita Popov via llvm-commits]

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@@ -1840,9 +1849,12 @@ PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level,
     MPM.addPass(CalledValuePropagationPass());
   }
 
-  // Now deduce any function attributes based in the current code.
-  MPM.addPass(
-      createModuleToPostOrderCGSCCPassAdaptor(PostOrderFunctionAttrsPass()));
+  // For higher optimization levels this Pass has just run, so don't repeat it.
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nikic wrote:

I don't think this is needed, LTO at `-O1` is not really something anybody cares about.

https://github.com/llvm/llvm-project/pull/111853