Serialize DoesNotEscape.

I forgot to commit this in r326530.

llvm-svn: 338656
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index 3250a2e..d83ac65 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -1097,6 +1097,7 @@
   Record.push_back(D->isVariadic());
   Record.push_back(D->blockMissingReturnType());
   Record.push_back(D->isConversionFromLambda());
+  Record.push_back(D->doesNotEscape());
   Record.push_back(D->capturesCXXThis());
   Record.push_back(D->getNumCaptures());
   for (const auto &capture : D->captures()) {