Use FqNameUnsafe instead of FqName in JVM intrinsics

#KT-4777 Fixed

compiler/testData/codegen/box/functions/localFunctions/kt4777.kt

@@ -0,0 +1,14 @@
+var result = "Fail"
+
+val p = object : Runnable {
+    override fun run() {
+        fun <T : Any> T.id() = this
+
+        result = "OK".id()
+    }
+}
+
+fun box(): String {
+    p.run()
+    return result
+}