[clang] [compiler-rt] [XRay][Darwin] Enable XRay runtime on macOS (arm64/x86_64) (PR #196848)

[Dan Blackwell via llvm-commits]

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@@ -135,26 +142,46 @@ void __xray_init() XRAY_NEVER_INSTRUMENT {
     atomic_store(&XRayFlagsInitialized, true, memory_order_release);
   }
 
+#if SANITIZER_APPLE
+  // Use the dyld image callback to discover XRay sections in all loaded
+  // images. This handles both the normal case (runtime linked into the
+  // binary) and the DYLD_INSERT_LIBRARIES injection case (runtime in a
+  // separate dylib, sleds in the host binary).
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DanBlackwell wrote:

Do you have to consider `dlopen` too?

https://github.com/llvm/llvm-project/pull/196848