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

[via llvm-commits]

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@@ -648,7 +741,9 @@ LLVMSymbolizer::getOrCreateModuleInfo(StringRef ModuleName) {
 
   auto I = Modules.find(ModuleName);
   if (I != Modules.end()) {
-    recordAccess(BinaryForPath.find(BinaryName)->second);
+    auto BinIter = BinaryForPath.find(BinaryName);
+    if (BinIter != BinaryForPath.end())
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midhuncodes7 wrote:

In some iteration 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. The behaviour is not changed its just split into multiple steps having the same logic

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