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Tom de Vries 18c4b05e40 [gdb/symtab] Dump m_all_parents_map for verbose debug dwarf-read
[ This is based on "[gdb/symtab] Add parent_map::dump" [1]. ]

When building the cooked index, gdb builds up a parent map.

This map is currently only visible at user level through the effect of using
it, but it's useful to be able to inspect it as well.

Add dumping of this parent map for "set debug dwarf-read 2".

As example, take test-case gdb.dwarf2/enum-type-c++.exp with target board
debug-types.

The parent map looks like:
...
$ gdb -q -batch \
    -iex "maint set worker-threads 0" \
    -iex "set debug dwarf-read 2" \
    outputs/gdb.dwarf2/enum-type-c++/enum-type-c++
  ...
[dwarf-read] print_stats: Final m_all_parents_map:
map start:
  0x0000000000000000 0x0
  0x0000000000000037 0x20f27d30 (0x36: ec)
  0x0000000000000051 0x0
  0x000000000000008b 0x20f27dc0 (0x8a: A)
  0x00000000000000a6 0x0
...

There's no parent entry at address 0xd6, which is part of what causes this:
...
(gdb) FAIL: gdb.dwarf2/enum-type-c++.exp: val1 has a parent
...

With the series containing the proposed fix applied [2], we get instead:
...
[dwarf-read] print_stats: Final m_all_parents_map:
map start:
  0x0000000000000000 0x0
  0x0000000000000026 0x7e0bdc0 (0x25: ns)
  0x0000000000000036 0x0
  0x0000000000000037 0x7e0bdf0 (0x36: ns::ec)
  0x0000000000000051 0x0
  0x000000000000007f 0x7e0be80 (0x7e: ns)
  0x000000000000008a 0x0
  0x000000000000008b 0x7e0beb0 (0x8a: ns::A)
  0x00000000000000a6 0x0
  0x00000000000000cc 0x7e0bf10 (0xcb: ns)
  0x00000000000000d4 0x7e0bf40 (0xd3: ns::A)
  0x00000000000000dc 0x7e0bf10 (0xcb: ns)
  0x00000000000000dd 0x7e0bf40 (0xd3: ns::A)
  0x00000000000000f6 0x0
...
and find at 0xd6 parent ns::A.

Tested on x86_64-linux.

Approved-By: Tom Tromey <tom@tromey.com>

[1] https://sourceware.org/pipermail/gdb-patches/2023-October/202883.html
[2] https://sourceware.org/pipermail/gdb-patches/2024-September/211958.html
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

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then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
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also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

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the Free Software Foundation, Inc.  See the file COPYING or
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