Handle whitespaces in argfiles correctly

#KT-27218 Fixed

compiler/tests/org/jetbrains/kotlin/cli/CustomCliTest.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.cli
+
+import org.jetbrains.kotlin.cli.jvm.K2JVMCompiler
+import org.jetbrains.kotlin.test.CompilerTestUtil
+import org.jetbrains.kotlin.test.TestCaseWithTmpdir
+import java.io.File
+
+class CustomCliTest : TestCaseWithTmpdir() {
+    fun testArgfileWithNonTrivialWhitespaces() {
+        val text = "-include-runtime\r\n\t\t-language-version\n\t1.2\r\n-version"
+        val argfile = File(tmpdir, "argfile").apply { writeText(text, Charsets.UTF_8) }
+        CompilerTestUtil.executeCompilerAssertSuccessful(K2JVMCompiler(), listOf("@" + argfile.absolutePath))
+    }
+}