[Bug symtab/28127] DW_FORM_data16 support

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28127

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
With this:
...
$ git diff
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 029b8bfad04..8b603e8acae 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -18247,6 +18247,9 @@ attr_to_dynamic_prop (const struct attribute *attr,
struct die
_info *die,
   if (attr == NULL || prop == NULL)
     return 0;

+  if (attr->form == DW_FORM_data16)
+    return 0;
+  
   if (attr->form_is_block ())
     {
       baton = XOBNEW (obstack, struct dwarf2_property_baton);
...
we have:
...
(gdb) PASS: gdb.ada/arrayptr.exp: scenario=all: ptype string_access
print pa_ptr.all^M
$7 = (10, 20, 30, 40, 50, 60, 62, 63, -23, 42)^M
(gdb) PASS: gdb.ada/arrayptr.exp: scenario=all: print pa_ptr.all
...
but also with set complaints 1000:
...
During symbol reading: Unresolved DW_AT_upper_bound - DIE at 0x1528 [in module
foo]
...

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