C++11: Allow brace-init-list in range-for statement.

Also drop the unused 'initializer' member from
RangeBasedForStatementAST.

Change-Id: I078ebbc85cafa643af4bfe62d698bf7de71360e4
Reviewed-by: hjk <qthjk@ovi.com>

tests/auto/cplusplus/cxx11/data/rangeFor.1.cpp

@@ -0,0 +1,5 @@
+int main() {
+    for (int x : {1, 2, 3}) {}
+    for (int x : foo) ;
+    for (int& x : array) x += 2;
+}

tests/auto/cplusplus/cxx11/tst_cxx11.cpp

@@ -141,6 +141,7 @@ void tst_cxx11::parse_data()
     QTest::newRow("defaultdeleteInitializer.1") << "defaultdeleteInitializer.1.cpp" << "";
     QTest::newRow("refQualifier.1") << "refQualifier.1.cpp" << "";
     QTest::newRow("alignofAlignas.1") << "alignofAlignas.1.cpp" << "";
+    QTest::newRow("rangeFor.1") << "rangeFor.1.cpp" << "";
 }
 
 void tst_cxx11::parse()