[PATCH 2/4] gas/Dwarf5: drop dead code

[Jan Beulich]

Commit 3417bfca676f ("GAS: DWARF-5: Ensure that the 0'th entry in the
directory table contains the current... ") added a "dwarf_level < 5"
check to out_dir_and_file_list(). This rendered dead that branch of the
construct, due to the enclosing if()'s "DWARF2_LINE_VERSION >= 5".
Delete that code as well as the corresponding part of the comment.

While there also drop a redundant "dirs != NULL": "dirs" will always be
non-NULL when dirs_in_use is not zero.

--- a/gas/dwarf2dbg.c
+++ b/gas/dwarf2dbg.c
@@ -2170,18 +2170,10 @@ out_dir_and_file_list (segT line_seg, in
       line_str_seg->entsize = 1;
 
       /* DWARF5 uses slot zero, but that is only set explicitly
-	 using a .file 0 directive.  If that isn't used, but dir
-	 one is used, then use that as main file directory.
-	 Otherwise use pwd as main file directory.  */
-      if (dirs_in_use > 0 && dirs != NULL && dirs[0] != NULL)
+	 using a .file 0 directive.  Otherwise use pwd as main file
+	 directory.  */
+      if (dirs_in_use > 0 && dirs[0] != NULL)
 	dir = remap_debug_filename (dirs[0]);
-      else if (dirs_in_use > 1
-	       && dirs != NULL
-	       && dirs[1] != NULL
-	       /* DWARF-5 directory tables expect dir[0] to be the same as
-		  DW_AT_comp_dir, which is the same as pwd.  */
-	       && dwarf_level < 5)
-	dir = remap_debug_filename (dirs[1]);
       else
 	dir = remap_debug_filename (getpwd ());