[clang] [llvm] [ThinLTO] Support dead RTTI data elimination under -fno-split-lto-unit (PR #126336)

[Teresa Johnson via cfe-commits]

================
@@ -1920,6 +1924,18 @@ Error LTO::runThinLTO(AddStreamFn AddStream, FileCache 
Cache,
       ThinLTO.CombinedIndex, WholeProgramVisibilityEnabledInLTO,
       DynamicExportSymbols, VisibleToRegularObjSymbols);
 
+  Triple TT(getTargetTriple());
+  DeadRTTIElimIndex(ThinLTO.CombinedIndex, TT).run();
+
+  if (!ThinLTO.CombinedIndex.withGlobalValueDeadStripping())
+    computeDeadSymbolsWithConstProp(ThinLTO.CombinedIndex, 
GUIDPreservedSymbols,
+                                    IsPrevailing, Conf.OptLevel > 0);
+
+
+  if (Conf.CombinedIndexHook &&
----------------
teresajohnson wrote:

Why this change?

https://github.com/llvm/llvm-project/pull/126336
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