Use module path instead of class path for stdlib on Java 9

Also report the "named does not read unnamed" error, which was not
possible previously because we wouldn't be able to read anything from
kotlin-stdlib (because it was added to the unnamed module by default)

compiler/testData/javaModules/dependencyOnStdlib/namedWithExplicitDependency/module-info.java

@@ -0,0 +1,3 @@
+module namedWithExplicitDependency {
+    requires kotlin.stdlib;
+}

compiler/testData/javaModules/dependencyOnStdlib/namedWithExplicitDependency/test.kt

@@ -0,0 +1,6 @@
+import kotlin.text.Regex
+
+fun f1(): List<String?> = emptyList()
+fun f2(): Array<Lazy<Unit>> = arrayOf()
+fun f3(map: Map<Int, Regex>): Collection<Regex> =
+        map.filterNot { (key, entry) -> "$key".equals(entry.toString(), ignoreCase = true) }.values