Renamed data -> testData in integration-tests.

compiler/integration-tests/testData/compilationFailed/hello.compile.expected

@@ -0,0 +1,4 @@
+OUT ERROR: [TestData]/hello.kt: (4, 5) Unresolved reference: a
+OUT WARNING: [TestData]/hello.kt: (4, 5) The expression is unused
+ERR exec() finished with COMPILATION_ERROR return code
+Return code: 1

compiler/integration-tests/testData/compilationFailed/hello.kt

@@ -0,0 +1,5 @@
+package Hello
+
+fun main(args : Array<String>) {
+    a
+}