[DWARF] Fix typo, .gnu_index -> .gdb_index

llvm-svn: 346039
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp b/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
index a29c9c2..00e37d7 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
@@ -581,7 +581,7 @@
                              DObj->getStringDWOSection(), dwo_units(),
                              isLittleEndian(), getMaxDWOVersion());
 
-  if (shouldDump(Explicit, ".gnu_index", DIDT_ID_GdbIndex,
+  if (shouldDump(Explicit, ".gdb_index", DIDT_ID_GdbIndex,
                  DObj->getGdbIndexSection())) {
     getGdbIndex().dump(OS);
   }