[ELF] Emit zeroFill as STT_OBJECT in the final executable. ld does this.

llvm-svn: 171704
diff --git a/lld/lib/ReaderWriter/ELF/WriterELF.cpp b/lld/lib/ReaderWriter/ELF/WriterELF.cpp
index a5459a3..082dcb5 100644
--- a/lld/lib/ReaderWriter/ELF/WriterELF.cpp
+++ b/lld/lib/ReaderWriter/ELF/WriterELF.cpp
@@ -1069,7 +1069,7 @@
         type = ELF::STT_OBJECT;
         break;
       case  DefinedAtom::typeZeroFill:
-        type = ELF::STT_COMMON;
+        type = ELF::STT_OBJECT;
         symbol->st_value = addr;
         break;
       default: