[llvm] AArch64: Partially move setting of libcall names out of TargetLowering (PR #142985)

[Daniel Paoliello via llvm-commits]

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@@ -11,6 +11,25 @@
 using namespace llvm;
 using namespace RTLIB;
 
+static cl::opt<bool>
+    HexagonEnableFastMathRuntimeCalls("hexagon-fast-math", cl::Hidden,
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dpaoliello wrote:

Why is this here?

https://github.com/llvm/llvm-project/pull/142985