[test] Don't run JS-specific irText tests against other backends

compiler/testData/ir/irText/js/dynamic/dynamicMemberIncrementDecrement.kt

@@ -1,3 +1,5 @@
+// TARGET_BACKEND: JS_IR
+
 // FIR_IDENTICAL
 
 fun testMemberIncrementDecrement(d: dynamic) {
@@ -12,4 +14,4 @@ fun testSafeMemberIncrementDecrement(d: dynamic) {
     val t2 = --d?.prefixDecr
     val t3 = d?.postfixIncr++
     val t4 = d?.postfixDecr--
-}
+}