[c++] Fix DECL_BY_REFERENCE of clone parms

Consider test.C compiled at -O0 -g:
...
class string {
public:
  string (const char *p) { this->p = p ; }
  string (const string &s) { this->p = s.p; }

private:
  const char *p;
};

class foo {
public:
  foo (string dir_hint) {}
};

int
main (void)
{
  std::string s = "This is just a string";
  foo bar(s);
  return 0;
}
...

When parsing foo::foo, the dir_hint parameter gets a DECL_ARG_TYPE of
'struct string & restrict'.  Then during finish_struct, we call
clone_constructors_and_destructors and create clones for foo::foo, and
set the DECL_ARG_TYPE in the same way.

Later on, during finish_function, cp_genericize is called for the original
foo::foo, which sets the type of parm dir_hint to DECL_ARG_TYPE, and sets
DECL_BY_REFERENCE of dir_hint to 1.

After that, during maybe_clone_body update_cloned_parm is called with:
...
(gdb) call debug_generic_expr (parm.typed.type)
struct string & restrict
(gdb) call debug_generic_expr (cloned_parm.typed.type)
struct string
...
The type of the cloned_parm is then set to the type of parm, but
DECL_BY_REFERENCE is not set.

When doing cp_genericize for the clone later on,
TREE_ADDRESSABLE (TREE_TYPE ()) is no longer true for the updated type for
the parm, so DECL_BY_REFERENCE is not set there either.

The missing DECL_BY_REFERENCE on cloned_parm causes incorrect debug info to be
generated.

This patch fixes the problem by copying DECL_BY_REFERENCE in update_cloned_parm.

Bootstrapped and reg-tested on x86_64.

2018-07-31  Tom de Vries  <tdevries@suse.de>

	PR debug/86687
	* optimize.c (update_cloned_parm): Copy DECL_BY_REFERENCE.

	* g++.dg/guality/pr86687.C: New test.

From-SVN: r263164

gcc/cp/ChangeLog

@@ -1,3 +1,8 @@
+2018-07-31  Tom de Vries  <tdevries@suse.de>
+
+	PR debug/86687
+	* optimize.c (update_cloned_parm): Copy DECL_BY_REFERENCE.
+
 2018-07-31  Jakub Jelinek  <jakub@redhat.com>
 
 	P1008R1 - prohibit aggregates with user-declared constructors

gcc/cp/optimize.c

@@ -46,6 +46,8 @@ update_cloned_parm (tree parm, tree cloned_parm, bool first)
   /* We may have taken its address.  */
   TREE_ADDRESSABLE (cloned_parm) = TREE_ADDRESSABLE (parm);
 
+  DECL_BY_REFERENCE (cloned_parm) = DECL_BY_REFERENCE (parm);
+
   /* The definition might have different constness.  */
   TREE_READONLY (cloned_parm) = TREE_READONLY (parm);
 

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2018-07-31  Tom de Vries  <tdevries@suse.de>
+
+	PR debug/86687
+	* g++.dg/guality/pr86687.C: New test.
+
 2018-07-31  Jakub Jelinek  <jakub@redhat.com>
 
 	P1008R1 - prohibit aggregates with user-declared constructors

gcc/testsuite/g++.dg/guality/pr86687.C

@@ -0,0 +1,28 @@
+// PR debug/86687
+// { dg-do run }
+// { dg-options "-g" }
+
+class string {
+public:
+  string (int p) { this->p = p ; }
+  string (const string &s) { this->p = s.p; }
+
+  int p;
+};
+
+class foo {
+public:
+  foo (string dir_hint) {
+    p = dir_hint.p; // { dg-final { gdb-test . "dir_hint.p" 3 } }
+  }
+
+  int p;
+};
+
+int
+main (void)
+{
+  string s = 3;
+  foo bar(s);
+  return !(bar.p == 3);
+}