Delay the creation of eh_frame so that the user can change the defaults.
Add support for SHT_X86_64_UNWIND.

llvm-svn: 124059
diff --git a/llvm/lib/MC/ELFObjectWriter.cpp b/llvm/lib/MC/ELFObjectWriter.cpp
index 77e078b..05dd0c7 100644
--- a/llvm/lib/MC/ELFObjectWriter.cpp
+++ b/llvm/lib/MC/ELFObjectWriter.cpp
@@ -1271,6 +1271,7 @@
   case ELF::SHT_INIT_ARRAY:
   case ELF::SHT_FINI_ARRAY:
   case ELF::SHT_PREINIT_ARRAY:
+  case ELF::SHT_X86_64_UNWIND:
     // Nothing to do.
     break;