Also create a shndx even if there are no symbols. This lets us test
.symtab_shndx reading and writing together, and finally we have a testcase for
r141440.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141641 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp
index e0ed862..3d16de5 100644
--- a/lib/MC/ELFObjectWriter.cpp
+++ b/lib/MC/ELFObjectWriter.cpp
@@ -666,6 +666,9 @@
     ExternalSymbolData[i].SymbolData->setIndex(Index++);
   for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
     UndefinedSymbolData[i].SymbolData->setIndex(Index++);
+
+  if (NumRegularSections > ELF::SHN_LORESERVE)
+    NeedsSymtabShndx = true;
 }
 
 void ELFObjectWriter::CreateRelocationSections(MCAssembler &Asm,