Add a test case

Author: tbaederr

clang/test/Frontend/diag-wrap-colors.cpp

@@ -0,0 +1,6 @@
+// RUN: not %clang_cc1 %s -fmessage-length=50 -fcolor-diagnostics -fno-show-source-location -o - 2>&1 | FileCheck %s
+
+struct F {
+  float a : 10;
+};
+// CHECK: bit-field 'a' has non-integral type 'float'