Add protected visibility to libLTO.

llvm-svn: 60257
diff --git a/llvm/include/llvm-c/lto.h b/llvm/include/llvm-c/lto.h
index c57dfe7..74a0703 100644
--- a/llvm/include/llvm-c/lto.h
+++ b/llvm/include/llvm-c/lto.h
@@ -30,9 +30,10 @@
     LTO_SYMBOL_DEFINITION_TENTATIVE   = 0x00000200,    
     LTO_SYMBOL_DEFINITION_WEAK        = 0x00000300,    
     LTO_SYMBOL_DEFINITION_UNDEFINED   = 0x00000400,    
-    LTO_SYMBOL_SCOPE_MASK             = 0x00001800,    
+    LTO_SYMBOL_SCOPE_MASK             = 0x00003800,    
     LTO_SYMBOL_SCOPE_INTERNAL         = 0x00000800,    
     LTO_SYMBOL_SCOPE_HIDDEN           = 0x00001000,    
+    LTO_SYMBOL_SCOPE_PROTECTED        = 0x00002000,    
     LTO_SYMBOL_SCOPE_DEFAULT          = 0x00001800    
 } lto_symbol_attributes;