[IR] Do not generate line numbers for synthesized data class members.

Fixes KT-41903.

compiler/testData/debug/localVariables/copyFunction.kt

@@ -7,7 +7,6 @@ fun box() {
     val b = a.copy(b = 3.0)
 }
 
-// IGNORE_BACKEND: JVM_IR
 // LOCAL VARIABLES
 // TestKt:6:
 // someClass:3: a:double, b:double

compiler/testData/debug/stepping/dataClass.kt

@@ -0,0 +1,61 @@
+// FILE: test.kt
+
+data class D(val i: Int, val s: String)
+
+data class E(val i: Int, val s: String) {
+    override fun toString() = "OK"
+    override fun equals(other: Any?) = false
+    override fun hashCode() = 42
+    fun copy() = E(i, s)
+}
+
+fun box() {
+    val d = D(1, "a")
+    d.equals(D(1, "a"))
+    d.hashCode()
+    d.toString()
+    val (i, s) = d
+    d.copy()
+    val e = E(1, "a")
+    e.equals(E(1, "a"))
+    e.hashCode()
+    e.toString()
+    val (s2, i2) = e
+    e.copy()
+}
+
+// LINENUMBERS
+// test.kt:13 box
+// test.kt:3 <init>
+// test.kt:13 box
+// test.kt:14 box
+// test.kt:3 <init>
+// test.kt:14 box
+// test.kt:15 box
+// test.kt:16 box
+// test.kt:17 box
+// test.kt:18 box
+// test.kt:3 <init>
+// test.kt:-1 copy
+// test.kt:18 box
+// test.kt:19 box
+// test.kt:5 <init>
+// test.kt:19 box
+// test.kt:20 box
+// test.kt:5 <init>
+// test.kt:20 box
+// test.kt:7 equals
+// test.kt:20 box
+// test.kt:21 box
+// test.kt:8 hashCode
+// test.kt:21 box
+// test.kt:22 box
+// test.kt:6 toString
+// test.kt:22 box
+// test.kt:23 box
+// test.kt:24 box
+// test.kt:9 copy
+// test.kt:5 <init>
+// test.kt:9 copy
+// test.kt:24 box
+// test.kt:25 box