[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/js/dynamic/dynamicBinaryEqualityOperator.sig.kt.txt

@@ -0,0 +1,20 @@
+// CHECK JS_IR NATIVE:
+//   Mangled name: #testEqeq(<dynamic>){}
+//   Public signature: /testEqeq|-1993622698448833276[0]
+fun testEqeq(d: dynamic): Boolean
+
+// CHECK JS_IR NATIVE:
+//   Mangled name: #testEqeqeq(<dynamic>){}
+//   Public signature: /testEqeqeq|6434412038753944189[0]
+fun testEqeqeq(d: dynamic): Boolean
+
+// CHECK JS_IR NATIVE:
+//   Mangled name: #testExclEq(<dynamic>){}
+//   Public signature: /testExclEq|-2117076107258151936[0]
+fun testExclEq(d: dynamic): Boolean
+
+// CHECK JS_IR NATIVE:
+//   Mangled name: #testExclEqeq(<dynamic>){}
+//   Public signature: /testExclEqeq|5516019862167337768[0]
+fun testExclEqeq(d: dynamic): Boolean
+