Add LTO_SYMBOL_DEFINITION_WEAKUNDEF, use that on the gold plugin.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69972 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm-c/lto.h b/include/llvm-c/lto.h
index 1d98814..98b9e08 100644
--- a/include/llvm-c/lto.h
+++ b/include/llvm-c/lto.h
@@ -30,6 +30,7 @@
     LTO_SYMBOL_DEFINITION_TENTATIVE   = 0x00000200,    
     LTO_SYMBOL_DEFINITION_WEAK        = 0x00000300,    
     LTO_SYMBOL_DEFINITION_UNDEFINED   = 0x00000400,    
+    LTO_SYMBOL_DEFINITION_WEAKUNDEF   = 0x00000500,
     LTO_SYMBOL_SCOPE_MASK             = 0x00003800,    
     LTO_SYMBOL_SCOPE_INTERNAL         = 0x00000800,    
     LTO_SYMBOL_SCOPE_HIDDEN           = 0x00001000,