[llvm] [BOLT] Add support for safe-icf (PR #116275)

[Maksim Panchenko via llvm-commits]

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@@ -340,6 +355,77 @@ typedef std::unordered_map<BinaryFunction *, std::vector<BinaryFunction *>,
 
 namespace llvm {
 namespace bolt {
+void IdenticalCodeFolding::initVTableReferences(const BinaryContext &BC) {
+  initVtable();
+  for (const auto &[Address, Data] : BC.getBinaryData()) {
+    // Filter out all symbols that are not vtables.
+    if (!Data->getName().starts_with("_ZTV"))
+      continue;
+    for (uint64_t I = Address, End = I + Data->getSize(); I < End; I += 8)
+      setAddressUsedInVTable(I);
+  }
+}
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maksfb wrote:

nit: insert empty lines between function definitions.

https://github.com/llvm/llvm-project/pull/116275