remove HasLocalSummary var as the Summary doesn't get built in this patch

Author: hassnaaHamdi

llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp

@@ -1363,10 +1363,10 @@ 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.
-  // This change should be safe only in LTO mode.
-  if (!HasLocalSummary && TheFn->hasLocalLinkage()) {
+  // 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()) {
     std::string NewName = (TheFn->getName() + ".llvm.merged").str();
 
     // Since we are renaming the function, any comdats with the same name must