[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/declarations/localClassWithOverrides.sig.kt.txt

@@ -0,0 +1,74 @@
+// CHECK:
+//   Mangled name: #outer(){}
+//   Public signature: /outer|1607449560170809066[0]
+fun outer(): Unit
+  // CHECK:
+  //   Mangled name: #outer(){}.ALocal
+  local abstract class ALocal {
+    // CHECK:
+    //   Mangled name: #outer(){}.ALocal#<init>(){}
+    constructor() /* primary */
+
+    // CHECK:
+    //   Mangled name: #outer(){}.ALocal#afun(){}
+    abstract fun afun(): Unit
+
+    // CHECK:
+    //   Mangled name: #outer(){}.ALocal{}aval
+    abstract val aval: Int
+      // CHECK JVM_IR:
+      //   Mangled name: #outer(){}.ALocal#<get-aval>(){}kotlin.Int
+      // CHECK JS_IR NATIVE:
+      //   Mangled name: #outer(){}.ALocal#<get-aval>(){}
+      abstract get
+
+    // CHECK:
+    //   Mangled name: #outer(){}.ALocal{}avar
+    abstract var avar: Int
+      // CHECK JVM_IR:
+      //   Mangled name: #outer(){}.ALocal#<get-avar>(){}kotlin.Int
+      // CHECK JS_IR NATIVE:
+      //   Mangled name: #outer(){}.ALocal#<get-avar>(){}
+      abstract get
+      // CHECK:
+      //   Mangled name: #outer(){}.ALocal#<set-avar>(kotlin.Int){}
+      abstract set
+
+  }
+
+  // CHECK:
+  //   Mangled name: #outer(){}.Local
+  local class Local : ALocal {
+    // CHECK:
+    //   Mangled name: #outer(){}.Local{}aval
+    override val aval: Int
+      field
+      // CHECK JVM_IR:
+      //   Mangled name: #outer(){}.Local#<get-aval>(){}kotlin.Int
+      // CHECK JS_IR NATIVE:
+      //   Mangled name: #outer(){}.Local#<get-aval>(){}
+      override get
+
+    // CHECK:
+    //   Mangled name: #outer(){}.Local{}avar
+    override var avar: Int
+      field
+      // CHECK JVM_IR:
+      //   Mangled name: #outer(){}.Local#<get-avar>(){}kotlin.Int
+      // CHECK JS_IR NATIVE:
+      //   Mangled name: #outer(){}.Local#<get-avar>(){}
+      override get
+      // CHECK:
+      //   Mangled name: #outer(){}.Local#<set-avar>(kotlin.Int){}
+      override set
+
+    // CHECK:
+    //   Mangled name: #outer(){}.Local#<init>(){}
+    constructor() /* primary */
+
+    // CHECK:
+    //   Mangled name: #outer(){}.Local#afun(){}
+    override fun afun(): Unit
+
+  }
+