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

[Hassnaa Hamdi via llvm-commits]

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@@ -1325,10 +1367,10 @@ bool DevirtModule::trySingleImplDevirt(
   if (!IsExported)
     return false;
 
-  // If the only implementation has local linkage, we must promote to external
-  // to make it visible to thin LTO objects. We can only get here during the
-  // ThinLTO export phase.
-  if (TheFn->hasLocalLinkage()) {
+  // Out of speculative devirtualization mode, if the only implementation has
+  // local linkage, we must promote to external to make it visible to thin LTO
+  // objects.
+  if (!DevirtSpeculatively && TheFn->hasLocalLinkage()) {
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hassnaaHamdi wrote:

I have added LTO flag. Please Let me know what do you think about it.

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