[Test] Renamed test case.

Replaced a - with a _.

Author: nate-chandler

lib/SIL/Utils/OwnershipLiveness.cpp

@@ -414,7 +414,7 @@ static FunctionTest LinearLivenessTest("linear_liveness", [](auto &function,
 // - the computed pruned liveness
 // - the liveness boundary
 static FunctionTest
-    InteriorLivenessTest("interior-liveness",
+    InteriorLivenessTest("interior_liveness",
                          [](auto &function, auto &arguments, auto &test) {
                            SILValue value = arguments.takeValue();
                            function.print(llvm::outs());