Improve diagnostic for missing BuiltInsLoader implementation

Also initialize it lazily to avoid wrapping the exception into
ExceptionInInitializerError

 #KT-20575

core/descriptors/src/org/jetbrains/kotlin/builtins/BuiltInsLoader.kt

@@ -34,7 +34,12 @@ interface BuiltInsLoader {
     ): PackageFragmentProvider
 
     companion object {
-        val Instance: BuiltInsLoader =
-                ServiceLoader.load(BuiltInsLoader::class.java, BuiltInsLoader::class.java.classLoader).first()
+        val Instance: BuiltInsLoader by lazy(LazyThreadSafetyMode.PUBLICATION) {
+            val implementations = ServiceLoader.load(BuiltInsLoader::class.java, BuiltInsLoader::class.java.classLoader)
+            implementations.firstOrNull() ?: throw IllegalStateException(
+                "No BuiltInsLoader implementation was found. Please ensure that the META-INF/services/ is not stripped " +
+                "from your application and that the Java virtual machine is not running under a security manager"
+            )
+        }
     }
 }