[llvm] Enable exp10 libcall on linux (PR #68736)

[Matt Arsenault via llvm-commits]

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@@ -139,9 +139,10 @@ define fp128 @powl_exp2l_not_fast(fp128 %x, fp128 %y) {
 ; TODO: exp10() is not widely enabled by many targets yet.
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arsenm wrote:

Update todo?

https://github.com/llvm/llvm-project/pull/68736