[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/objectByNameInsideObject.sig.kt.txt

@@ -0,0 +1,68 @@
+// CHECK:
+//   Mangled name: Base
+//   Public signature: /Base|null[0]
+open class Base {
+  // CHECK:
+  //   Mangled name: Base{}f1
+  //   Public signature: /Base.f1|-3626880138223960403[0]
+  val f1: Function0<Any>
+    field
+    // CHECK JVM_IR:
+    //   Mangled name: Base#<get-f1>(){}kotlin.Function0<kotlin.Any>
+    //   Public signature: /Base.f1.<get-f1>|8566118280674785385[0]
+    // CHECK JS_IR NATIVE:
+    //   Mangled name: Base#<get-f1>(){}
+    //   Public signature: /Base.f1.<get-f1>|-4995485398991269878[0]
+    get
+
+  // CHECK:
+  //   Mangled name: Base#<init>(kotlin.Function0<kotlin.Any>){}
+  //   Public signature: /Base.<init>|-4146636346230466645[0]
+  constructor(f1: Function0<Any>) /* primary */
+
+}
+
+// CHECK:
+//   Mangled name: Thing
+//   Public signature: /Thing|null[0]
+object Thing : Base {
+  // CHECK:
+  //   Mangled name: Thing#<init>(){}
+  //   Public signature: /Thing.<init>|-5645683436151566731[0]
+  private constructor() /* primary */
+    // CHECK JVM_IR:
+    //   Mangled name: Thing#<init>(){}#<anonymous>#static(){}kotlin.Any
+    // CHECK JS_IR NATIVE:
+    //   Mangled name: Thing#<init>(){}#<anonymous>#static(){}
+    local fun <anonymous>(): Any
+
+  // CHECK JVM_IR:
+  //   Mangled name: Thing#test1(){}Thing
+  //   Public signature: /Thing.test1|3967638963180272121[0]
+  // CHECK JS_IR NATIVE:
+  //   Mangled name: Thing#test1(){}
+  //   Public signature: /Thing.test1|4297044443957252634[0]
+  fun test1(): Thing
+
+  // CHECK JVM_IR:
+  //   Mangled name: Thing#test2(){}Thing
+  //   Public signature: /Thing.test2|-7201124175106784013[0]
+  // CHECK JS_IR NATIVE:
+  //   Mangled name: Thing#test2(){}
+  //   Public signature: /Thing.test2|4279114864133353152[0]
+  fun test2(): Thing
+
+  // CHECK:
+  //   Mangled name: Thing{}f1
+  //   Public signature: /Thing.f1|-3626880138223960403[0]
+  /* fake */ override val f1: Function0<Any>
+    // CHECK JVM_IR:
+    //   Mangled name: Thing#<get-f1>(){}kotlin.Function0<kotlin.Any>
+    //   Public signature: /Thing.f1.<get-f1>|8566118280674785385[0]
+    // CHECK JS_IR NATIVE:
+    //   Mangled name: Thing#<get-f1>(){}
+    //   Public signature: /Thing.f1.<get-f1>|-4995485398991269878[0]
+    /* fake */ override get(): Function0<Any>
+
+}
+