Add missing PCH support for -fstack-protector.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82435 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHWriter.cpp b/lib/Frontend/PCHWriter.cpp
index a6918e4..531c6f7 100644
--- a/lib/Frontend/PCHWriter.cpp
+++ b/lib/Frontend/PCHWriter.cpp
@@ -625,6 +625,7 @@
                                            // unsigned type
   Record.push_back(LangOpts.getGCMode());
   Record.push_back(LangOpts.getVisibilityMode());
+  Record.push_back(LangOpts.getStackProtectorMode());
   Record.push_back(LangOpts.InstantiationDepth);
   Record.push_back(LangOpts.OpenCL);
   Record.push_back(LangOpts.ElideConstructors);