[Test] Add ability to specify applicability of diagnostic to module or file

compiler/testData/codegen/box/delegation/diamond2.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
 // FILE: Base.java
 
 public interface Base {
@@ -17,7 +18,6 @@ public interface Base2 extends Base {
 
 
 // FILE: main.kt
-// JVM_TARGET: 1.8
 
 interface KBase : Base {
     override fun test() = "O" + getValue()