Added LLVM Asm/Bitcode Reader/Writer support for new IR keyword externally_initialized.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174340 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index 85e7574..2c806be 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -463,6 +463,7 @@
   KEYWORD(hidden);
   KEYWORD(protected);
   KEYWORD(unnamed_addr);
+  KEYWORD(externally_initialized);
   KEYWORD(extern_weak);
   KEYWORD(external);
   KEYWORD(thread_local);