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/CodeGen/AsmPrinter/DwarfCompileUnit.h b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
index ecffb25..2a8b648 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
@@ -34,7 +34,7 @@
//===----------------------------------------------------------------------===//
/// CompileUnit - This dwarf writer support class manages information associated
/// with a source file.
-class CompileUnit {
+class LLVM_LIBRARY_VISIBILITY CompileUnit {
/// UniqueID - a numeric ID unique among all CUs in the module
///
unsigned UniqueID;