[clang] [sanitizer] Document AddressSanitizer security considerations (PR #100937)

[Florian Mayer via cfe-commits]

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@@ -313,6 +313,14 @@ Limitations
   usually expected.
 * Static linking of executables is not supported.
 
+Security Considerations
+=======================
+
+AddressSanitizer is a bug detection tool and is not meant to be linked
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fmayer wrote:

nit: maybe "its runtime is not meant to be linked?"

https://github.com/llvm/llvm-project/pull/100937