JVM_IR: generate "safe" names for functions in init blocks

compiler/testData/codegen/box/closures/localFunctionInInitBlock.kt

@@ -0,0 +1,28 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+
+lateinit var result1: String
+lateinit var result2: String
+
+class Test(val x: String) {
+    fun test(a: String) {
+        if (result1 != a) throw AssertionError("result1: $result1")
+        result2 = a
+    }
+
+    init {
+        fun test() {
+            fun test1() {
+                result1 = x
+            }
+            test1()
+        }
+        test()
+    }
+}
+
+fun box(): String {
+    val t = Test("OK")
+    t.test("OK")
+
+    return result2
+}