[clang] [llvm] [Clang]: Enable speculative devirtualization (PR #159685)

[Teresa Johnson via cfe-commits]

================
@@ -1641,6 +1642,24 @@ 
PassBuilder::buildModuleOptimizationPipeline(OptimizationLevel Level,
   if (!LTOPreLink)
     MPM.addPass(RelLookupTableConverterPass());
 
+  if (PTO.DevirtualizeSpeculatively && LTOPhase == ThinOrFullLTOPhase::None) {
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teresajohnson wrote:

Add a TODO about LTO

https://github.com/llvm/llvm-project/pull/159685
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