Tests: remove stepping tests on old JVM backend

compiler/testData/debug/stepping/simpleInlineDefaultArg.kt

@@ -11,30 +11,11 @@ fun box(): String {
     return ifoo()
 }
 
-// `alsoInline` is inlined in the `ifoo$default` stub. When exiting the inline
-// codegen, the line number is reset. Therefore any code generated with line
-// number information will emit a new line number so that stepping continues
-// in the caller.
-//
-// For JVM none of the code after `alsoInline` leads to line number generation.
-// This seems problematic as the line number for the inline function is then
-// in effect for instructions outside the scope of the `$i$f$alsoInline`
-// variable life time.
-//
-// For JVM_IR a line number is generated for the code following `alsoInline`.
-// Therefore, we stop on line 5 before entering `alsoInline`
-// and we step back to line 5 after `alsoInline` and before the body of
-// `ifoo`. This seems reasonable and also help ensure that line numbers
-// for the inline function are only used for instructions covered by
-// the `$i$f$alsoInline` variable life time.
-
-// EXPECTATIONS JVM JVM_IR
+// EXPECTATIONS JVM_IR
 // test.kt:11 box
 // test.kt:6 box
 // test.kt:4 box
-// EXPECTATIONS JVM_IR
 // test.kt:6 box
-// EXPECTATIONS JVM JVM_IR
 // test.kt:7 box
 // test.kt:11 box