libiberty: Initialize d_printing in all cplus_demangle_fill_* functions.

While integrating the d_printing recursion guard change into gdb I
noticed we forgot to initialize the demangle_component d_printing
field in cplus_demangle_fill_{name,extended_operator,ctor,dtor}.
As is done in cplus_demangle_fill_{component,builtin_type,operator}.
It happened to work because in gcc all demangle_components were
allocated through d_make_empty. But gdb has its own allocation
mechanism (as might other users).

libiberty/ChangeLog:

       * cp-demangle.c (cplus_demangle_fill_name): Initialize
       demangle_component d_printing.
       (cplus_demangle_fill_extended_operator): Likewise.
       (cplus_demangle_fill_ctor): Likewise.
       (cplus_demangle_fill_dtor): Likewise.

From-SVN: r246105

libiberty/ChangeLog

+2017-03-12  Mark Wielaard  <mark@klomp.org>
+
+	* cp-demangle.c (cplus_demangle_fill_name): Initialize
+	demangle_component d_printing.
+	(cplus_demangle_fill_extended_operator): Likewise.
+	(cplus_demangle_fill_ctor): Likewise.
+	(cplus_demangle_fill_dtor): Likewise.
+
 2017-03-08  Mark Wielaard  <mark@klomp.org>
 
 	PR demangler/70909

libiberty/cp-demangle.c

@@ -854,6 +854,7 @@ cplus_demangle_fill_name (struct demangle_component *p, const char *s, int len)
 {
   if (p == NULL || s == NULL || len == 0)
     return 0;
+  p->d_printing = 0;
   p->type = DEMANGLE_COMPONENT_NAME;
   p->u.s_name.s = s;
   p->u.s_name.len = len;
@@ -869,6 +870,7 @@ cplus_demangle_fill_extended_operator (struct demangle_component *p, int args,
 {
   if (p == NULL || args < 0 || name == NULL)
     return 0;
+  p->d_printing = 0;
   p->type = DEMANGLE_COMPONENT_EXTENDED_OPERATOR;
   p->u.s_extended_operator.args = args;
   p->u.s_extended_operator.name = name;
@@ -888,6 +890,7 @@ cplus_demangle_fill_ctor (struct demangle_component *p,
       || (int) kind < gnu_v3_complete_object_ctor
       || (int) kind > gnu_v3_object_ctor_group)
     return 0;
+  p->d_printing = 0;
   p->type = DEMANGLE_COMPONENT_CTOR;
   p->u.s_ctor.kind = kind;
   p->u.s_ctor.name = name;
@@ -907,6 +910,7 @@ cplus_demangle_fill_dtor (struct demangle_component *p,
       || (int) kind < gnu_v3_deleting_dtor
       || (int) kind > gnu_v3_object_dtor_group)
     return 0;
+  p->d_printing = 0;
   p->type = DEMANGLE_COMPONENT_DTOR;
   p->u.s_dtor.kind = kind;
   p->u.s_dtor.name = name;