Store/retrieve -fshort-enums for PCH, fixes rdar://8854933.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@123510 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index 54a2648..4fa48fa 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -941,6 +941,9 @@
   Record.push_back(LangOpts.CharIsSigned); // Whether char is a signed or
                                            // unsigned type
   Record.push_back(LangOpts.ShortWChar);  // force wchar_t to be unsigned short
+  Record.push_back(LangOpts.ShortEnums);  // Should the enum type be equivalent
+                                          // to the smallest integer type with
+                                          // enough room.
   Record.push_back(LangOpts.getGCMode());
   Record.push_back(LangOpts.getVisibilityMode());
   Record.push_back(LangOpts.getStackProtectorMode());