[llvm] [llvm-symbolizer] Recognize AIX big archive (PR #150401)

[via llvm-commits]

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@@ -716,9 +811,9 @@ LLVMSymbolizer::getOrCreateModuleInfo(StringRef ModuleName) {
       createModuleInfo(Objects.first, std::move(Context), ModuleName);
   if (ModuleOrErr) {
     auto I = Modules.find(ModuleName);
-    BinaryForPath.find(BinaryName)->second.pushEvictor([this, I]() {
-      Modules.erase(I);
-    });
+    auto BinIter = BinaryForPath.find(BinaryName);
+    if (BinIter != BinaryForPath.end())
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midhuncodes7 wrote:

In some iterations the `BinaryForPath.find(BinaryName)` fails and returns `BinaryForPath.end()` but the previous code doesn't check for it, so it ends up calling `pushEvictor` on invalid memory. This results in a crash, hence a check is added.

https://github.com/llvm/llvm-project/pull/150401