[gdb/symtab] Don't complain about inlined functions

With the test-case included in this patch, we get:
...
(gdb) ptype main^M
During symbol reading: cannot get low and high bounds for subprogram DIE \
  at 0x113^M
During symbol reading: cannot get low and high bounds for subprogram DIE \
  at 0x11f^M
type = int (void)^M
(gdb) FAIL: gdb.dwarf2/inline.exp: ptype main
...

The complaints are about foo, with DW_AT_inline == DW_INL_inlined:
...
 <1><11f>: Abbrev Number: 6 (DW_TAG_subprogram)
    <120>   DW_AT_name        : foo
    <126>   DW_AT_prototyped  : 1
    <126>   DW_AT_type        : <0x10c>
    <12a>   DW_AT_inline      : 1       (inlined)
...
and foo2, with DW_AT_inline == DW_INL_declared_inlined:
...
 <1><113>: Abbrev Number: 5 (DW_TAG_subprogram)
    <114>   DW_AT_name        : foo2
    <11a>   DW_AT_prototyped  : 1
    <11a>   DW_AT_type        : <0x10c>
    <11e>   DW_AT_inline      : 3       (declared as inline and inlined)
...

Fix this by not complaining about inlined functions.

Tested on x86_64-linux.

gdb/dwarf2/read.c

@@ -12044,7 +12044,14 @@ read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
       <= PC_BOUNDS_INVALID)
     {
       attr = dwarf2_attr (die, DW_AT_external, cu);
-      if (attr == nullptr || !attr->as_boolean ())
+      bool external_p = attr != nullptr && attr->as_boolean ();
+      attr = dwarf2_attr (die, DW_AT_inline, cu);
+      bool inlined_p
+	= (attr != nullptr
+	   && attr->is_nonnegative ()
+	   && (attr->as_nonnegative () == DW_INL_inlined
+	       || attr->as_nonnegative () == DW_INL_declared_inlined));
+      if (!external_p && !inlined_p)
 	complaint (_("cannot get low and high bounds "
 		     "for subprogram DIE at %s"),
 		   sect_offset_str (die->sect_off));

gdb/testsuite/gdb.dwarf2/inline.c

@@ -0,0 +1,34 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2022 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+static int __attribute__((always_inline))
+foo (void)
+{
+  return 0;
+}
+
+static int inline __attribute__((always_inline))
+foo2 (void)
+{
+  return 0;
+}
+
+int
+main (void)
+{
+  return foo () + foo2 ();
+}

gdb/testsuite/gdb.dwarf2/inline.exp

@@ -0,0 +1,32 @@
+# Copyright 2022 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+standard_testfile .c
+
+if [prepare_for_testing "failed to prepare" $testfile $srcfile \
+	{debug nowarnings}] {
+    return -1
+}
+
+set cmd "ptype main"
+
+set re \
+    [multi_line \
+	 $cmd \
+	 "type = int \\(void\\)"]
+
+with_complaints 5 {
+    gdb_test $cmd $re "$cmd without complaints"
+}