[gdb] Mention CU offset for <artifical> if verbose

Say we're debugging a test-case with CUs with name "<artificial>", meaning
not originating from a single file compilation, and use the verbose setting:
...
$ gdb -iex "set verbose on" -batch cc1
Reading symbols from cc1...
Reading in symbols for <artificial>... \
  and /tmp/trunk/gcc/attribs.c... \
  ...
  and /tmp/trunk/gcc/tree-ssa-reassoc.c... \
  done.
...

From the "/tmp/trunk/gcc/attribs.c" message, it's clear which CU is loaded.  But
that's not the case for the "<artificial>" message.

The message uses the filename field of struct partial_symtab, which is
documented like this:
...
  /* Name of the source file which this partial_symtab defines,
     or if the psymtab is anonymous then a descriptive name for
     debugging purposes, or "".  It must not be NULL.  */
...

So, fix this by setting the filename field to a more descriptive name than
"<artificial>", by appending the CU offset.

This way, we print instead:
...
$ gdb -iex "set verbose on" -batch cc1
Reading symbols from cc1...
Reading in symbols for <artificial>@0x41146d9 \
  and /tmp/trunk/gcc/attribs.c... \
  ... \
  and /tmp/trunk/gcc/tree-ssa-reassoc.c... \
  done.
...

Build and reg-tested on x86_64-linux.

gdb/ChangeLog:

2020-02-07  Tom de Vries  <tdevries@suse.de>

	* dwarf2read.c (create_partial_symtab): Append CU offset to filename
	if it matches "<artificial>".

---
 gdb/dwarf2read.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index dafe01d94a..5acae3eab8 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -8020,6 +8020,10 @@ create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
   struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
   dwarf2_psymtab *pst;
 
+  static const char artificial[] = "<artificial>";
+  if (strcmp (name, artificial) == 0)
+    name = concat (artificial, "@", sect_offset_str (per_cu->sect_off), NULL);
+
   pst = new dwarf2_psymtab (name, objfile, 0);
 
   pst->psymtabs_addrmap_supported = true;