Back-end: correct indexes of local variables for double and long

#KT-3033 Fixed

compiler/testData/codegen/dataClasses/copy/kt3033.kt

@@ -0,0 +1,10 @@
+data class A(val a: Double, val b: Double)
+
+fun box() : String {
+    val a = A(1.0, 1.0)
+    val b = a.copy()
+    if (b.a == 1.0 && b.b == 1.0) {
+        return "OK"
+    }
+    return "fail"
+}