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

[Roland McGrath 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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frobtech wrote:

This comment is not precisely true of all `isOSFuchsia()` cases. That is, it says this is true only if the target supports non-TLSDESC as a non-default option.  That's not true for `aarch64-*`, so it's not true for `*-fuchsia`.
If that's actually fine for how this is used, then the comment here should be changed.

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