[llvm] [WPD]: Enable speculative devirtualizatoin. (PR #159048)

[Teresa Johnson via llvm-commits]

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@@ -790,11 +812,22 @@ struct DevirtIndex {
 PreservedAnalyses WholeProgramDevirtPass::run(Module &M,
                                               ModuleAnalysisManager &MAM) {
   if (UseCommandLine) {
-    if (!DevirtModule::runForTesting(M, MAM))
+    if (!DevirtModule::runForTesting(M, MAM, ClDevirtualizeSpeculatively))
       return PreservedAnalyses::all();
     return PreservedAnalyses::none();
   }
-  if (!DevirtModule(M, MAM, ExportSummary, ImportSummary).run())
+
+  std::optional<ModuleSummaryIndex> Index;
+  if (!ExportSummary && !ImportSummary && DevirtSpeculatively) {
+    // Build the ExportSummary from the module.
+    assert(!ExportSummary &&
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teresajohnson wrote:

This assert is redundant with the enclosing if condition

https://github.com/llvm/llvm-project/pull/159048