Read/write C++0x static_assert for PCH.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109123 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHWriterDecl.cpp b/lib/Frontend/PCHWriterDecl.cpp
index 122bd3d..f6c6cde 100644
--- a/lib/Frontend/PCHWriterDecl.cpp
+++ b/lib/Frontend/PCHWriterDecl.cpp
@@ -989,7 +989,10 @@
 }
 
 void PCHDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
-  assert(false && "cannot write StaticAssertDecl");
+  VisitDecl(D);
+  Writer.AddStmt(D->getAssertExpr());
+  Writer.AddStmt(D->getMessage());
+  Code = pch::DECL_STATIC_ASSERT;
 }
 
 /// \brief Emit the DeclContext part of a declaration context decl.