Add CompileTimeCalculation annotation as helper to interpreter's tests

compiler/testData/ir/interpreter/helpers/CompileTimeCalculation.kt

@@ -0,0 +1,9 @@
+package kotlin
+
+/**
+ * Specify that marked function is calculated in compile time and it result can be stored as "const val"
+ * Must be used only on built ins methods and further will be replaced with "constexpr" modifier
+ */
+@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY)
+@Retention(AnnotationRetention.BINARY)
+public annotation class CompileTimeCalculation