[JVM] Port line number tests to stepping framework.

Allow specifying JVM and JVM_IR as well as shared expectations.

Add the method name to the step.

Discard steps in synthetic methods.

compiler/testData/debug/stepping/enum.kt

@@ -0,0 +1,22 @@
+// FILE: test.kt
+
+enum class E {
+    E1;
+
+    fun foo() = {
+        prop
+    }
+
+    val prop = 22
+}
+
+fun box() {
+    E.E1.foo()
+}
+
+// LINENUMBERS
+// test.kt:14 box
+// test.kt:6 foo
+// test.kt:8 foo
+// test.kt:14 box
+// test.kt:15 box