Debug info: Make DWARF4 the default for Darwin, too.

llvm-svn: 201375
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index d52b0ff..feac80d 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -2657,9 +2657,6 @@
       // FIXME: we should support specifying dwarf version with
       // -gline-tables-only.
       CmdArgs.push_back("-gline-tables-only");
-      // Default is dwarf-2 for darwin.
-      if (getToolChain().getTriple().isOSDarwin())
-        CmdArgs.push_back("-gdwarf-2");
     } else if (A->getOption().matches(options::OPT_gdwarf_2))
       CmdArgs.push_back("-gdwarf-2");
     else if (A->getOption().matches(options::OPT_gdwarf_3))
@@ -2667,13 +2664,8 @@
     else if (A->getOption().matches(options::OPT_gdwarf_4))
       CmdArgs.push_back("-gdwarf-4");
     else if (!A->getOption().matches(options::OPT_g0) &&
-             !A->getOption().matches(options::OPT_ggdb0)) {
-      // Default is dwarf-2 for darwin.
-      if (getToolChain().getTriple().isOSDarwin())
-        CmdArgs.push_back("-gdwarf-2");
-      else
-        CmdArgs.push_back("-g");
-    }
+             !A->getOption().matches(options::OPT_ggdb0))
+      CmdArgs.push_back("-g");
   }
 
   // We ignore flags -gstrict-dwarf and -grecord-gcc-switches for now.