[libunwind] [libunwind] Add CMake option to enable execute-only code generation on AArch64 (PR #140554)

[Csanád Hajdú via cfe-commits]

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@@ -16,6 +16,8 @@
 
 #if defined(_AIX)
   .toc
+#elif defined(__aarch64__) && defined(__ELF__) && defined(_LIBUNWIND_EXECUTE_ONLY_CODE)
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Il-Capitano wrote:

@MaskRay Do you have any thoughts on this? I would prefer to keep the code as-is if you agree with my reasoning above.

https://github.com/llvm/llvm-project/pull/140554