[clang] [PAC][clang] Implement address/type discrimination for VTT vtable pointers (PR #205808)

[Kristina Bessonova via cfe-commits]

================
@@ -636,27 +636,27 @@ CodeGenModule::computeVTPointerAuthentication(const 
CXXRecordDecl *ThisClass,
 }
 
 std::optional<PointerAuthQualifier>
-CodeGenModule::getVTablePointerAuthentication(const CXXRecordDecl *Record) {
+CodeGenModule::getVTablePointerAuthentication(const CXXRecordDecl *Record,
+                                              bool IsVTTEntry) {
   if (!Record->getDefinition() || !Record->isPolymorphic())
     return std::nullopt;
 
-  auto Existing = VTablePtrAuthInfos.find(Record);
-  std::optional<PointerAuthQualifier> Authentication;
-  if (Existing != VTablePtrAuthInfos.end()) {
-    Authentication = Existing->getSecond();
-  } else {
-    Authentication = computeVTPointerAuthentication(Record);
-    VTablePtrAuthInfos.insert(std::make_pair(Record, Authentication));
+  if (!IsVTTEntry) {
+    auto Existing = VTablePtrAuthInfos.find(Record);
+    if (Existing != VTablePtrAuthInfos.end())
+      return Existing->getSecond();
   }
+  std::optional<PointerAuthQualifier> Authentication =
+      computeVTPointerAuthentication(Record, IsVTTEntry);
+  if (!IsVTTEntry)
+    VTablePtrAuthInfos.insert(std::make_pair(Record, Authentication));
   return Authentication;
----------------
chbessonova wrote:

Fixed.

https://github.com/llvm/llvm-project/pull/205808
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