Fix interaction between serialization and c++1z feature.
In c++1z, static_assert is not required to have a StringLiteral message, where
previously it was required. Update the AST Reader to be able to handle a
null StringLiteral.
llvm-svn: 281286
diff --git a/clang/test/Modules/Inputs/static_assert/a.h b/clang/test/Modules/Inputs/static_assert/a.h
new file mode 100644
index 0000000..e876df0
--- /dev/null
+++ b/clang/test/Modules/Inputs/static_assert/a.h
@@ -0,0 +1,3 @@
+class S {
+ static_assert(4 == 4);
+};
diff --git a/clang/test/Modules/Inputs/static_assert/module.modulemap b/clang/test/Modules/Inputs/static_assert/module.modulemap
new file mode 100644
index 0000000..bb00c84
--- /dev/null
+++ b/clang/test/Modules/Inputs/static_assert/module.modulemap
@@ -0,0 +1 @@
+module a { header "a.h" }
diff --git a/clang/test/Modules/static_assert.cpp b/clang/test/Modules/static_assert.cpp
new file mode 100644
index 0000000..d1b7590
--- /dev/null
+++ b/clang/test/Modules/static_assert.cpp
@@ -0,0 +1,8 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fimplicit-module-maps \
+// RUN: -I%S/Inputs/static_assert -std=c++1z -verify %s
+// expected-no-diagnostics
+
+#include "a.h"
+
+S s;