Give internal classes hidden visibility.

Worth 100k on a linux/x86_64 Release+Asserts clang.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190534 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLParser.h b/lib/AsmParser/LLParser.h
index 594281e..4af6e97 100644
--- a/lib/AsmParser/LLParser.h
+++ b/lib/AsmParser/LLParser.h
@@ -42,7 +42,7 @@
   /// There are several cases where we have to parse the value but where the
   /// type can depend on later context.  This may either be a numeric reference
   /// or a symbolic (%var) reference.  This is just a discriminated union.
-  struct ValID {
+  struct LLVM_LIBRARY_VISIBILITY ValID {
     enum {
       t_LocalID, t_GlobalID,      // ID in UIntVal.
       t_LocalName, t_GlobalName,  // Name in StrVal.
@@ -83,7 +83,7 @@
     }
   };
 
-  class LLParser {
+  class LLVM_LIBRARY_VISIBILITY LLParser {
   public:
     typedef LLLexer::LocTy LocTy;
   private: