[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/contextReceivers/fromKEEP/monoidSum.sig.kt.txt

@@ -0,0 +1,93 @@
+// CHECK:
+//   Mangled name: Monoid
+//   Public signature: /Monoid|null[0]
+interface Monoid<T : Any?> : Semigroup<T> {
+  // CHECK JVM_IR:
+  //   Mangled name: Monoid#combine@1:0(1:0){}1:0
+  //   Public signature: /Monoid.combine|-3517256775590682507[0]
+  abstract /* fake */ override infix fun T.combine(other: T): T
+
+  // CHECK:
+  //   Mangled name: Monoid{}unit
+  //   Public signature: /Monoid.unit|-5200734743185576787[0]
+  abstract val unit: T
+    // CHECK JVM_IR:
+    //   Mangled name: Monoid#<get-unit>(){}1:0
+    //   Public signature: /Monoid.unit.<get-unit>|-2842189358620964971[0]
+    abstract get
+
+}
+
+// CHECK:
+//   Mangled name: Semigroup
+//   Public signature: /Semigroup|null[0]
+interface Semigroup<T : Any?> {
+
+  // CHECK JVM_IR:
+  //   Mangled name: Semigroup#combine@1:0(1:0){}1:0
+  //   Public signature: /Semigroup.combine|-3517256775590682507[0]
+  abstract infix fun T.combine(other: T): T
+
+}
+
+// CHECK:
+//   Mangled name: IntMonoid
+//   Public signature: /IntMonoid|null[0]
+object IntMonoid : Monoid<Int> {
+  // CHECK:
+  //   Mangled name: IntMonoid{}unit
+  //   Public signature: /IntMonoid.unit|-5200734743185576787[0]
+  override val unit: Int
+    // CHECK JVM_IR:
+    //   Mangled name: IntMonoid#<get-unit>(){}kotlin.Int
+    //   Public signature: /IntMonoid.unit.<get-unit>|3772729924213749256[0]
+    override get
+
+  // CHECK:
+  //   Mangled name: IntMonoid#<init>(){}
+  //   Public signature: /IntMonoid.<init>|-5645683436151566731[0]
+  private constructor() /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: IntMonoid#combine@kotlin.Int(kotlin.Int){}kotlin.Int
+  //   Public signature: /IntMonoid.combine|4765448259581317405[0]
+  override infix fun Int.combine(other: Int): Int
+
+}
+
+// CHECK:
+//   Mangled name: StringMonoid
+//   Public signature: /StringMonoid|null[0]
+object StringMonoid : Monoid<String> {
+  // CHECK:
+  //   Mangled name: StringMonoid{}unit
+  //   Public signature: /StringMonoid.unit|-5200734743185576787[0]
+  override val unit: String
+    // CHECK JVM_IR:
+    //   Mangled name: StringMonoid#<get-unit>(){}kotlin.String
+    //   Public signature: /StringMonoid.unit.<get-unit>|4504480110251605077[0]
+    override get
+
+  // CHECK:
+  //   Mangled name: StringMonoid#<init>(){}
+  //   Public signature: /StringMonoid.<init>|-5645683436151566731[0]
+  private constructor() /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: StringMonoid#combine@kotlin.String(kotlin.String){}kotlin.String
+  //   Public signature: /StringMonoid.combine|-5815259829474546918[0]
+  override infix fun String.combine(other: String): String
+
+}
+
+// CHECK JVM_IR:
+//   Mangled name: #box(){}kotlin.String
+//   Public signature: /box|-9347091776561469[0]
+fun box(): String
+
+// CHECK JVM_IR:
+//   Mangled name computed from Ir:         #sum@kotlin.collections.List<0:0>(Monoid<0:0>){0§<kotlin.Any?>}0:0
+//   Mangled name computed from Descriptor: #sum!Monoid<0:0>@kotlin.collections.List<0:0>(){0§<kotlin.Any?>}0:0
+//   Public signature: /sum|7635142307973834922[0]
+fun <T : Any?> List<T>.sum($context_receiver_0: Monoid<T>): T
+