[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/contextReceiverMethod.sig.kt.txt

@@ -0,0 +1,42 @@
+// CHECK:
+//   Mangled name: Context
+//   Public signature: /Context|null[0]
+class Context {
+  // CHECK:
+  //   Mangled name: Context#<init>(){}
+  //   Public signature: /Context.<init>|-5645683436151566731[0]
+  constructor() /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: Context#foo(){}kotlin.Int
+  //   Public signature: /Context.foo|-1256155405684507276[0]
+  fun foo(): Int
+
+}
+
+// CHECK:
+//   Mangled name: Test
+//   Public signature: /Test|null[0]
+class Test {
+  // CHECK:
+  //   Mangled name computed from Ir:         Test#<init>(Context){}
+  //   Mangled name computed from Descriptor: Test#<init>!Context(){}
+  //   Public signature: /Test.<init>|4848133296495274545[0]
+  constructor($context_receiver_0: Context) /* primary */
+  // CHECK:
+  //   Mangled name computed from Ir:         Test.contextReceiverField0
+  //   Mangled name computed from Descriptor: Test{}contextReceiverField0#jf
+  private /* final field */ val contextReceiverField0: Context
+
+  // CHECK:
+  //   Mangled name: Test#bar(){}
+  //   Public signature: /Test.bar|496682602797471549[0]
+  fun bar(): Unit
+
+  // CHECK JVM_IR:
+  //   Mangled name: Test#foo(){}kotlin.Int
+  //   Public signature: /Test.foo|-1256155405684507276[0]
+  fun foo(): Int
+
+}
+