FIR: support copy functions in data classes

compiler/fir/resolve/testData/resolve/copy.kt

@@ -0,0 +1,8 @@
+data class Some(val x: Int, val y: String)
+
+fun test(some: Some) {
+    val other = some.copy(y = "123")
+    val another = some.copy(x = 123)
+    val same = some.copy()
+    val different = some.copy(456, "456")
+}

compiler/fir/resolve/testData/resolve/copy.txt

@@ -0,0 +1,31 @@
+FILE: copy.kt
+    public final data class Some : R|kotlin/Any| {
+        public constructor(x: R|kotlin/Int|, y: R|kotlin/String|): R|Some| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final val x: R|kotlin/Int| = R|<local>/x|
+            public get(): R|kotlin/Int|
+
+        public final val y: R|kotlin/String| = R|<local>/y|
+            public get(): R|kotlin/String|
+
+        public final fun component1(): R|kotlin/Int| {
+            ^component1 R|/Some.x|
+        }
+
+        public final fun component2(): R|kotlin/String| {
+            ^component2 R|/Some.y|
+        }
+
+        public final fun copy(x: R|kotlin/Int| = R|/Some.x|, y: R|kotlin/String| = R|/Some.y|): R|Some| {
+            ^copy R|/Some.Some|(R|<local>/x|, R|<local>/y|)
+        }
+
+    }
+    public final fun test(some: R|Some|): R|kotlin/Unit| {
+        lval other: R|Some| = R|<local>/some|.R|/Some.copy|(y = String(123))
+        lval another: R|Some| = R|<local>/some|.R|/Some.copy|(x = Int(123))
+        lval same: R|Some| = R|<local>/some|.R|/Some.copy|()
+        lval different: R|Some| = R|<local>/some|.R|/Some.copy|(Int(456), String(456))
+    }

compiler/fir/resolve/testData/resolve/stdlib/components.txt

@@ -18,6 +18,10 @@ FILE: components.kt
             ^component2 R|/D.y|
         }
 
+        public final fun copy(x: R|kotlin/Int| = R|/D.x|, y: R|kotlin/String| = R|/D.y|): R|D| {
+            ^copy R|/D.D|(R|<local>/x|, R|<local>/y|)
+        }
+
     }
     public final fun foo(list: R|kotlin/collections/List<D>|): R|kotlin/Unit| {
         lval <range>: R|kotlin/collections/List<D>| = R|<local>/list|