'quick' directory renamed to 'tests' which reflects its contents

compiler/testData/diagnostics/tests/PrimaryConstructors.jet

@@ -0,0 +1,14 @@
+class <!PRIMARY_CONSTRUCTOR_MISSING_STATEFUL_PROPERTY!>X<!> {
+  val <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>x<!> : Int
+}
+
+open class Y() {
+  val x : Int = 2
+}
+
+class Y1 {
+  val x : Int get() = 1
+}
+
+class Z : Y<!PRIMARY_CONSTRUCTOR_MISSING_SUPER_CONSTRUCTOR_CALL!>()<!> {
+}