[test] Add the NATIVE backend to non-JVM check blocks in signature tests

(see KT-59204)

compiler/testData/ir/irText/firProblems/kt59102.sig.kt.txt

@@ -9,7 +9,7 @@ class XAlign {
     // CHECK JVM_IR:
     //   Mangled name: XAlign#<get-bits>(){}kotlin.Long
     //   Public signature: /XAlign.bits.<get-bits>|-8015099027032327963[0]
-    // CHECK JS_IR:
+    // CHECK JS_IR NATIVE:
     //   Mangled name: XAlign#<get-bits>(){}
     //   Public signature: /XAlign.bits.<get-bits>|-3920031234897259044[0]
     get