Separate incremental JS legacy / standard incremental test fails

compiler/incremental-compilation-impl/test/org/jetbrains/kotlin/incremental/AbstractIncrementalCompilerRunnerTestBase.kt

@@ -56,9 +56,11 @@ abstract class AbstractIncrementalCompilerRunnerTestBase<Args : CommonCompilerAr
             parseCommandLineArguments(parseAdditionalArgs(testDir), this)
         }
 
+    open fun failFile(testDir: File): File = testDir.resolve(FAIL_FILE_NAME)
+
     fun doTest(path: String) {
         val testDir = File(path)
-        val failFile = testDir.resolve(FAIL_FILE_NAME)
+        val failFile = failFile(testDir)
         var testPassed = false
         try {
             doTestImpl(testDir)

compiler/incremental-compilation-impl/test/org/jetbrains/kotlin/incremental/AbstractIncrementalK1JsLegacyCompilerRunnerTest.kt

@@ -47,4 +47,6 @@ abstract class AbstractIncrementalK1JsLegacyCompilerRunnerTest : AbstractIncreme
         }
 
     protected open val scopeExpansionMode = CompileScopeExpansionMode.NEVER
+
+    override fun failFile(testDir: File): File = testDir.resolve("fail_js_legacy.txt")
 }