[IR] Dump IdSignatures and mangled names in irText tests

The reason #1 for this feature is that we want to test IdSignatures
generated for declarations. Currently, there is no (easy) way to ensure
that a change in the signature building logic doesn't cause any breaking
changes wrt klibs.

Now, most IdSignatures include hashed mangled names in them, so even if
we catch a regression where the included hash changes, there would be no
way of knowing immediately what caused it, unless we'd also have mangled
names in the expectations.

The reason #2 is to test the manglers themselves. Currently, there are
no tests for them. They heavily duplicate each other, this is already
causing issues (see KT-57427) that would be very hard to catch without
these tests.

^KT-58238 Fixed

compiler/testData/ir/irText/expressions/objectReference.sig.kt.txt

@@ -0,0 +1,82 @@
+// CHECK:
+//   Mangled name: Z
+//   Public signature: /Z|null[0]
+object Z {
+  // CHECK:
+  //   Mangled name: Z{}counter
+  //   Public signature: /Z.counter|3849500605769271673[0]
+  var counter: Int
+    // CHECK JVM_IR:
+    //   Mangled name: Z#<get-counter>(){}kotlin.Int
+    //   Public signature: /Z.counter.<get-counter>|6416265643848993228[0]
+    // CHECK JS_IR NATIVE:
+    //   Mangled name: Z#<get-counter>(){}
+    //   Public signature: /Z.counter.<get-counter>|6903507550118978958[0]
+    get
+    // CHECK:
+    //   Mangled name: Z#<set-counter>(kotlin.Int){}
+    //   Public signature: /Z.counter.<set-counter>|-8124462411591632783[0]
+    set
+
+  // CHECK:
+  //   Mangled name: Z{}aLambda
+  //   Public signature: /Z.aLambda|3337321219156655813[0]
+  val aLambda: Function0<Unit>
+    // CHECK JVM_IR:
+    //   Mangled name: Z#<get-aLambda>(){}kotlin.Function0<kotlin.Unit>
+    //   Public signature: /Z.aLambda.<get-aLambda>|9058518221524596568[0]
+    // CHECK JS_IR NATIVE:
+    //   Mangled name: Z#<get-aLambda>(){}
+    //   Public signature: /Z.aLambda.<get-aLambda>|8927671768328125269[0]
+    get
+
+  // CHECK:
+  //   Mangled name: Z{}anObject
+  //   Public signature: /Z.anObject|409091113626572731[0]
+  val anObject: Any
+    // CHECK JVM_IR:
+    //   Mangled name: Z#<get-anObject>(){}kotlin.Any
+    //   Public signature: /Z.anObject.<get-anObject>|-6807306499596507825[0]
+    // CHECK JS_IR NATIVE:
+    //   Mangled name: Z#<get-anObject>(){}
+    //   Public signature: /Z.anObject.<get-anObject>|6468357437342963609[0]
+    get
+
+  // CHECK:
+  //   Mangled name: Z.Nested
+  //   Public signature: /Z.Nested|null[0]
+  class Nested {
+    // CHECK:
+    //   Mangled name: Z.Nested#<init>(){}
+    //   Public signature: /Z.Nested.<init>|-5645683436151566731[0]
+    constructor() /* primary */
+
+    // CHECK:
+    //   Mangled name: Z.Nested#test(){}
+    //   Public signature: /Z.Nested.test|6620506149988718649[0]
+    fun test(): Unit
+
+  }
+
+  // CHECK:
+  //   Mangled name: Z#<init>(){}
+  //   Public signature: /Z.<init>|-5645683436151566731[0]
+  private constructor() /* primary */
+
+  // CHECK:
+  //   Mangled name: Z#bar(){}
+  //   Public signature: /Z.bar|496682602797471549[0]
+  fun bar(): Unit
+
+  // CHECK:
+  //   Mangled name: Z#foo(){}
+  //   Public signature: /Z.foo|-1041209573719867811[0]
+  fun foo(): Unit
+
+}
+
+// CHECK:
+//   Mangled name: #test@Z(){}
+//   Public signature: /test|2491484829934192138[0]
+fun Z.test(): Unit
+