[mc] Fix ELF st_other flag.

ELF_Other_Weakref and ELF_Other_ThumbFunc seems to be LLVM
internal ELF symbol flags.  These should not be emitted to
object file.

This commit defines ELF_STO_Shift for the target-defined
flags for st_other, and increase the value of
ELF_Other_Shift to 16.

llvm-svn: 196440
diff --git a/llvm/lib/MC/ELFObjectWriter.cpp b/llvm/lib/MC/ELFObjectWriter.cpp
index 9899bb2..972c64c 100644
--- a/llvm/lib/MC/ELFObjectWriter.cpp
+++ b/llvm/lib/MC/ELFObjectWriter.cpp
@@ -551,8 +551,7 @@
   // Other and Visibility share the same byte with Visibility using the lower
   // 2 bits
   uint8_t Visibility = MCELF::GetVisibility(OrigData);
-  uint8_t Other = MCELF::getOther(OrigData) <<
-    (ELF_Other_Shift - ELF_STV_Shift);
+  uint8_t Other = MCELF::getOther(OrigData) << (ELF_STO_Shift - ELF_STV_Shift);
   Other |= Visibility;
 
   uint64_t Value = SymbolValue(Data, Layout);