Replace deprecated join with joinToString in testData

compiler/testData/codegen/boxWithStdlib/reified/copyToArray.kt

@@ -6,10 +6,10 @@ inline fun <reified T> copy(c: Collection<T>): Array<T> {
 
 fun box(): String {
     val a: Array<String> = copy(listOf("a", "b", "c"))
-    assertEquals("abc", a.join(""))
+    assertEquals("abc", a.joinToString(""))
 
     val b: Array<Int> = copy(listOf(1,2,3))
-    assertEquals("123", b.map { it.toString() }.join(""))
+    assertEquals("123", b.map { it.toString() }.joinToString(""))
 
     return "OK"
 }

compiler/testData/codegen/boxWithStdlib/reified/spreads.kt

@@ -14,11 +14,11 @@ fun box(): String {
 
     var i = 0
     val a: Array<String> = bar(arrayOf("1", "2")) { i++; i.toString() }
-    assertEquals("1234", a.join(""))
+    assertEquals("1234", a.joinToString(""))
 
     i = 0
     val b: Array<Int> = bar(arrayOf(0, 1)) { i++ }
-    assertEquals("0123", b.map { it.toString() }.join(""))
+    assertEquals("0123", b.map { it.toString() }.joinToString(""))
 
     return "OK"
 }

compiler/testData/codegen/boxWithStdlib/reified/varargs.kt

@@ -13,11 +13,11 @@ inline fun <reified T> empty() = arrayOf<T>()
 fun box(): String {
     var i = 0
     val a: Array<String> = bar() { i++; i.toString() }
-    assertEquals("345", a.join(""))
+    assertEquals("345", a.joinToString(""))
 
     i = 0
     val b: Array<Int> = bar() { i++ }
-    assertEquals("234", b.map { it.toString() }.join(""))
+    assertEquals("234", b.map { it.toString() }.joinToString(""))
 
     val c: Array<String> = empty()
     assertEquals(0, c.size())