Add X86::reloc_global_offset_table and use it to have a single place where
we check for _GLOBAL_OFFSET_TABLE_.

llvm-svn: 117241
diff --git a/llvm/lib/Target/X86/X86AsmBackend.cpp b/llvm/lib/Target/X86/X86AsmBackend.cpp
index 17db41a..be56719 100644
--- a/llvm/lib/Target/X86/X86AsmBackend.cpp
+++ b/llvm/lib/Target/X86/X86AsmBackend.cpp
@@ -39,6 +39,7 @@
   case X86::reloc_riprel_4byte:
   case X86::reloc_riprel_4byte_movq_load:
   case X86::reloc_signed_4byte:
+  case X86::reloc_global_offset_table:
   case FK_Data_4: return 2;
   case FK_Data_8: return 3;
   }