Replace llvm::error_code with std::error_code.

llvm-svn: 210780
diff --git a/clang/lib/Serialization/GlobalModuleIndex.cpp b/clang/lib/Serialization/GlobalModuleIndex.cpp
index 8516951..a1bec89 100644
--- a/clang/lib/Serialization/GlobalModuleIndex.cpp
+++ b/clang/lib/Serialization/GlobalModuleIndex.cpp
@@ -787,7 +787,7 @@
   GlobalModuleIndexBuilder Builder(FileMgr);
   
   // Load each of the module files.
-  llvm::error_code EC;
+  std::error_code EC;
   for (llvm::sys::fs::directory_iterator D(Path, EC), DEnd;
        D != DEnd && !EC;
        D.increment(EC)) {