Use C++11 compatible version of static_assert; before

C++17 the second message parameter to static_assert was
not optional.

Some particularly old compiler (gcc-5) was having trouble
https://travis-ci.org/github/google/verible/jobs/669946250#L1428

PiperOrigin-RevId: 304449377

common/util/forward_test.cc

@@ -46,7 +46,8 @@ TEST(ForwardReferenceElseConstructTest, ForwardReferenceConst) {
 TEST(ForwardReferenceElseConstructTest, Construct) {
   const TestClassA a;
   const auto& ref = ForwardReferenceElseConstruct<TestClassB>()(a);
-  static_assert(!std::is_same<decltype(ref), TestClassA>::value);
+  static_assert(!std::is_same<decltype(ref), TestClassA>::value,
+                "!std::is_same<decltype(ref), TestClassA>::value");
 }
 
 TEST(ForwardReferenceElseConstructTest, ForwardStringView) {
@@ -58,7 +59,8 @@ TEST(ForwardReferenceElseConstructTest, ForwardStringView) {
 TEST(ForwardReferenceElseConstructTest, ConstructString) {
   const absl::string_view a("hello");
   const auto& ref = ForwardReferenceElseConstruct<std::string>()(a);
-  static_assert(!std::is_same<decltype(ref), absl::string_view>::value);
+  static_assert(!std::is_same<decltype(ref), absl::string_view>::value,
+                "!std::is_same<decltype(ref), absl::string_view>::value");
 }
 
 TEST(ForwardReferenceElseConstructTest, ForwardString) {
@@ -70,7 +72,8 @@ TEST(ForwardReferenceElseConstructTest, ForwardString) {
 TEST(ForwardReferenceElseConstructTest, ConstructStringView) {
   const std::string a("hello");
   const auto& ref = ForwardReferenceElseConstruct<absl::string_view>()(a);
-  static_assert(!std::is_same<decltype(ref), std::string>::value);
+  static_assert(!std::is_same<decltype(ref), std::string>::value,
+                "!std::is_same<decltype(ref), std::string>::value");
 }
 
 }  // namespace