[binutils-gdb] Remove unused field cooked_index::m_start

[Tom Tromey <tromey@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5400535a70cd5f7626f4110a69508ad9ff669328

commit 5400535a70cd5f7626f4110a69508ad9ff669328
Author: Tom Tromey <tromey@adacore.com>
Date:   Fri May 13 13:47:39 2022 -0600

    Remove unused field cooked_index::m_start
    
    cooked_index::m_start is unused and can be removed.  I think this was
    a leftover from a previous approach in the index finalization code,
    and then when rewriting it I forgot to remove it.
    
    Tested by rebuilding.

Diff:
---
 gdb/dwarf2/cooked-index.h | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/gdb/dwarf2/cooked-index.h b/gdb/dwarf2/cooked-index.h
index 1d229586948..ad4de05ba52 100644
--- a/gdb/dwarf2/cooked-index.h
+++ b/gdb/dwarf2/cooked-index.h
@@ -230,11 +230,6 @@ private:
   /* If we found "main" or an entry with 'is_main' set, store it
      here.  */
   cooked_index_entry *m_main = nullptr;
-  /* When constructing the index, entries are stored on a linked list.
-     This member points to the head of that list.  Later, they are
-     entered into the hash table, at which point this is no longer
-     used.  */
-  cooked_index_entry *m_start = nullptr;
   /* The addrmap.  This maps address ranges to dwarf2_per_cu_data
      objects.  */
   addrmap *m_addrmap = nullptr;