[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/firProblems/inapplicableCollectionSet.sig.kt.txt

@@ -0,0 +1,43 @@
+// CHECK:
+//   Mangled name: Flaf
+//   Public signature: /Flaf|null[0]
+class Flaf {
+  // CHECK:
+  //   Mangled name: Flaf{}javaName
+  //   Public signature: /Flaf.javaName|-8684515170534215532[0]
+  val javaName: String
+    // CHECK JVM_IR:
+    //   Mangled name: Flaf#<get-javaName>(){}kotlin.String
+    //   Public signature: /Flaf.javaName.<get-javaName>|-917464454700477406[0]
+    // CHECK JS_IR NATIVE:
+    //   Mangled name: Flaf#<get-javaName>(){}
+    //   Public signature: /Flaf.javaName.<get-javaName>|1070493169031219158[0]
+    get
+
+  // CHECK:
+  //   Mangled name: Flaf{}INSTANCES
+  //   Public signature: /Flaf.INSTANCES|1897835723956041094[0]
+  private val INSTANCES: MutableMap<String, Flaf>
+    // CHECK JVM_IR:
+    //   Mangled name: Flaf#<get-INSTANCES>(){}kotlin.collections.MutableMap<kotlin.String,Flaf>
+    //   Public signature: /Flaf.INSTANCES.<get-INSTANCES>|-852664816279800923[0]
+    // CHECK JS_IR NATIVE:
+    //   Mangled name: Flaf#<get-INSTANCES>(){}
+    //   Public signature: /Flaf.INSTANCES.<get-INSTANCES>|7621104418939940009[0]
+    private get
+
+  // CHECK:
+  //   Mangled name: Flaf#<init>(kotlin.String){}
+  //   Public signature: /Flaf.<init>|1280618353163213788[0]
+  constructor(javaName: String) /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: Flaf#forJavaName(kotlin.String){}Flaf
+  //   Public signature: /Flaf.forJavaName|5746555906334011497[0]
+  // CHECK JS_IR NATIVE:
+  //   Mangled name: Flaf#forJavaName(kotlin.String){}
+  //   Public signature: /Flaf.forJavaName|-6191380422625646968[0]
+  fun forJavaName(javaName: String): Flaf
+
+}
+