[clang] [llvm] [WPD]: Apply speculative WPD in non-lto mode. (PR #145031)

[Hassnaa Hamdi via llvm-commits]

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@@ -1112,6 +1150,11 @@ bool DevirtModule::tryFindVirtualCallTargets(
     // calls to pure virtuals are UB.
     if (Fn->getName() == "__cxa_pure_virtual")
       continue;
+    // In Most cases empty functions will be overridden by the
+    // implementation of the derived class, so we can skip them.
+    if (DevirtCheckMode == WPDCheckMode::Fallback &&
+        Fn->getReturnType()->isVoidTy() && Fn->getInstructionCount() <= 1)
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hassnaaHamdi wrote:

refactored

https://github.com/llvm/llvm-project/pull/145031