[Bug ada/26999] replace_operator_with_call fails to set newexp->elts

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

https://sourceware.org/bugzilla/show_bug.cgi?id=26999

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Tentative patch:
...
diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 906671155d..956cf52720 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -4002,14 +4002,10 @@ replace_operator_with_call (expression_up *expp, int
pc, int n
args,
 {
   /* A new expression, with 6 more elements (3 for funcall, 4 for function
      symbol, -oplen for operator being replaced).  */
-  struct expression *newexp = (struct expression *)
-    xzalloc (sizeof (struct expression)
-            + EXP_ELEM_TO_BYTES ((*expp)->nelts + 7 - oplen));
   struct expression *exp = expp->get ();
+  struct expression *newexp
+    = new expression (exp->language_defn, exp->gdbarch, exp->nelts + 7 -
oplen);

-  newexp->nelts = exp->nelts + 7 - oplen;
-  newexp->language_defn = exp->language_defn;
-  newexp->gdbarch = exp->gdbarch;
   memcpy (newexp->elts, exp->elts, EXP_ELEM_TO_BYTES (pc));
   memcpy (newexp->elts + pc + 7, exp->elts + pc + oplen,
          EXP_ELEM_TO_BYTES (exp->nelts - pc - oplen));
...

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