add local variable test. This test runs box() method and checks local variable types and names avaiable at every step.

compiler/testData/debug/localVariables/copyFunction.kt

@@ -0,0 +1,20 @@
+//FILE: test.kt
+
+data class someClass(val a: Double, val b: Double)
+
+fun box() {
+    val a = someClass(1.0, 2.0)
+    val b = a.copy(b = 3.0)
+}
+
+// IGNORE_BACKEND: JVM_IR
+// LOCAL VARIABLES
+// TestKt:6:
+// someClass:3: a:double, b:double
+// TestKt:6:
+// TestKt:7: a:someClass
+// someClass:3: a:double, b:double
+// someClass.copy(double, double)+9: a:double, b:double
+// someClass.copy$default(someClass, double, double, int, java.lang.Object)+30:
+// TestKt:7: a:someClass
+// TestKt:8: a:someClass, b:someClass