[llvm] Enable logf128 constant folding for AArch64 (PR #96287)

[David Green via llvm-commits]

================
@@ -11,7 +11,14 @@
 
 namespace llvm {
 
-#if defined(__clang__) && defined(__FLOAT128__) &&                             \
+#if defined(__aarch64__)
----------------
davemgreen wrote:

I would expect we might need to be careful of systems that have long-double==double, such as windows and darwin targets.

https://github.com/llvm/llvm-project/pull/96287