[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/protectedJavaFieldRef.sig.kt.txt

@@ -0,0 +1,25 @@
+// CHECK:
+//   Mangled name: Derived
+//   Public signature: /Derived|null[0]
+class Derived : Base {
+  // CHECK:
+  //   Mangled name: Derived{}ref
+  //   Public signature: /Derived.ref|-1081516401990928556[0]
+  val ref: KMutableProperty0<String?>
+    // CHECK JVM_IR:
+    //   Mangled name: Derived#<get-ref>(){}kotlin.reflect.KMutableProperty0<kotlin.String?>
+    //   Public signature: /Derived.ref.<get-ref>|-6985556442168523841[0]
+    get
+
+  // CHECK:
+  //   Mangled name: Derived#<init>(){}
+  //   Public signature: /Derived.<init>|-5645683436151566731[0]
+  constructor() /* primary */
+
+  // CHECK:
+  //   Mangled name: Derived#set(){}
+  //   Public signature: /Derived.set|-7365752122041802629[0]
+  fun set(): Unit
+
+}
+