[JVM] Improve debug step behavior around lambdas.

- Add tests to clarify problematic behavior
- Avoid line numbers on return instructions of lambdas without explicit returns

compiler/testData/debug/stepping/lambdaStepInline.kt

@@ -0,0 +1,23 @@
+
+// FILE: test.kt
+inline fun foo(stringMaker: () -> String): String {
+    return stringMaker()
+}
+
+fun box(): String {
+    foo { "OK "}
+    foo {
+        "OK"
+        // Comment
+    }
+    return "OK"
+}
+
+// LINENUMBERS
+// test.kt:8
+// test.kt:4
+// test.kt:8
+// test.kt:9
+// test.kt:4
+// test.kt:10
+// test.kt:13