[SimplifyLibCalls] Don't hardcode the function name.

llvm-svn: 252342
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 76a28e1..2eb9938 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -1093,7 +1093,8 @@
     if (Op1C->isExactlyValue(2.0) &&
         hasUnaryFloatFn(TLI, Op1->getType(), LibFunc::exp2, LibFunc::exp2f,
                         LibFunc::exp2l))
-      return EmitUnaryFloatFnCall(Op2, "exp2", B, Callee->getAttributes());
+      return EmitUnaryFloatFnCall(Op2, TLI->getName(LibFunc::exp2), B,
+                                  Callee->getAttributes());
     // pow(10.0, x) -> exp10(x)
     if (Op1C->isExactlyValue(10.0) &&
         hasUnaryFloatFn(TLI, Op1->getType(), LibFunc::exp10, LibFunc::exp10f,