[clang] [llvm] [llvm] Enable TLSDESC by default on Fuchsia targets (PR #124990)

[Paul Kirth via llvm-commits]

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@@ -1119,7 +1119,9 @@ class Triple {
 
   /// True if the target supports both general-dynamic and TLSDESC, and TLSDESC
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ilovepi wrote:

Yeah, the comment here is a bit inaccurate. I've updated it to reflect how it's used in practice. Our Aarch64 implementation does not account for non-TLSDESC, and thus does not check if TLSDESC is enabled, like we do for other backends. 

https://github.com/llvm/llvm-project/pull/124990