Tests: remove stepping tests on old JVM backend

compiler/testData/debug/stepping/namedCallableReference.kt

@@ -11,19 +11,11 @@ fun f(block: () -> Unit) {
 
 fun g() {}
 
-// The synthetic invoke bridge method generated for in the callable reference has line numbers
-// in the JVM_IR backend (as all bridges). In the JVM backend, only some bridges have line numbers.
-// For some reason, when the bridge does not have line numbers, there is no method entry event
-// for the invoke method bridged to. Therefore, the entry line number for invoke only shows
-// up for JVM_IR.
-
-// EXPECTATIONS JVM JVM_IR
+// EXPECTATIONS JVM_IR
 // test.kt:4 box
 // test.kt:5 box
 // test.kt:9 f
-// EXPECTATIONS JVM_IR
 // test.kt:5 invoke
-// EXPECTATIONS JVM JVM_IR
 // test.kt:12 g
 // test.kt:5 invoke
 // test.kt:9 f