Add a -fno-elide-constructors option to clang-cc.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@79782 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index b368124..c025fcd 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -107,6 +107,7 @@
   PARSE_LANGOPT_BENIGN(getVisibilityMode());
   PARSE_LANGOPT_BENIGN(InstantiationDepth);
   PARSE_LANGOPT_IMPORTANT(OpenCL, diag::warn_pch_opencl);
+  PARSE_LANGOPT_IMPORTANT(ElideConstructors, diag::warn_elide_constructors);
 #undef PARSE_LANGOPT_IRRELEVANT
 #undef PARSE_LANGOPT_BENIGN