[FIR] Fix computing mangled names for top-level functions and properties

^KT-57433 Fixed

compiler/testData/ir/irText/declarations/kt45308.kt

@@ -2,9 +2,6 @@
 // IGNORE_BACKEND_K1: JS_IR
 // IGNORE_BACKEND_K1: JS_IR_ES6
 
-// MUTE_SIGNATURE_COMPARISON_K2: ANY
-// ^ KT-57433
-
 // MODULE: a
 // FILE: a.kt
 package a

compiler/testData/ir/irText/declarations/kt45308.sig.kt.txt

@@ -13,6 +13,9 @@ package b
 // CHECK JVM_IR:
 //   Mangled name: b#foo(kotlin.Function0<kotlin.String>){}kotlin.String
 //   Public signature: b/foo|-5020381652845254261[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: b#foo(kotlin.Function0<kotlin.String>){}
+//   Public signature: b/foo|-2695324588787180624[0]
 fun foo(f: Function0<String>): String
 
 // MODULE: c
@@ -21,5 +24,8 @@ fun foo(f: Function0<String>): String
 // CHECK JVM_IR:
 //   Mangled name: #box(){}kotlin.String
 //   Public signature: /box|-9347091776561469[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #box(){}
+//   Public signature: /box|2173511048851971368[0]
 fun box(): String
 

compiler/testData/ir/irText/declarations/provideDelegate/javaDelegate.kt

@@ -2,9 +2,6 @@
 // TARGET_BACKEND: JVM
 // SKIP_KT_DUMP
 
-// MUTE_SIGNATURE_COMPARISON_K2: ANY
-// ^ KT-57433
-
 // FILE: box.kt
 
 package k