[compiler-rt] [compiler-rt][builtins][test][darwin] Fix some compiler-rt builtins tests on Apple platforms (PR #207895)

[Ian Anderson via llvm-commits]

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@@ -63,11 +63,13 @@ int main() {
     defined(__i386__) || defined(__x86_64__)
 // Skip these tests on Windows because the UCRT scalbn function always behaves
 // as if the default rounding mode is set (FE_TONEAREST).
+// Also skip on Apple because the libm scalbn flushes underflow to zero
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ian-twilightcoder wrote:

The CI is on macOS 26.2 and I'm on macOS 26.5.1. I found a bug for this, 174012883, must have been introduced between those two versions. Should I just leave these tests alone and I'll just remember to ignore them when I run tests locally?

https://github.com/llvm/llvm-project/pull/207895