[committed] prune warning from test output to avoid arm-none-eabi failure (PR 83303)

[Martin Sebor]

For reference, I committed r255450 to avoid the test failure
reported on the arm-none-eabi target.  The warning is valid
but unrelated to the purpose of the test so I pruned it from
its output.

Martin

Index: gcc/testsuite/ChangeLog
===================================================================
--- gcc/testsuite/ChangeLog     (revision 255449)
+++ gcc/testsuite/ChangeLog     (working copy)
@@ -9,6 +9,9 @@

 2017-12-06  Martin Sebor  <mse...@redhat.com>

+       PR testsuite/83303
+       * g++.dg/opt/new1.C: Prune warning from test output.
+
        PR tree-optimization/82646
        * gcc.dg/builtin-stringop-chk-1.c: Adjust.
        * gcc.dg/builtin-stringop-chk-9.c: New test.
Index: gcc/testsuite/g++.dg/opt/new1.C
===================================================================
--- gcc/testsuite/g++.dg/opt/new1.C     (revision 255449)
+++ gcc/testsuite/g++.dg/opt/new1.C     (working copy)
@@ -1,4 +1,4 @@
-// PR c++/39367
+// PR c++/39367 - ICE at tree-inline.c:1042 with -O
 // { dg-options "-O" }

 class QScriptEnginePrivate;
@@ -37,6 +37,11 @@ template <typename T> void QScript::Buffer<T>::res
       reserve (s << 1);
 }
 template <typename T> void QScript::Buffer<T>::reserve(int x) {
+    /* The following may be optimized into a trap because the function
+       is called from resize(0) and so with m_capacity < 0.  When not
+       optimized it may trigger -Walloc-size-larger-than= since
+       operator new() is called with an excessively large value.
+       The warning is pruned from the test output below.  */
     T *new_data = new T[m_capacity];
     for (int i=0; i<m_size; ++i)
       new_data[i] = m_data[i];
@@ -69,3 +74,5 @@ namespace QScript {
           }
     }
 }
+
+// { dg-prune-output "\\\[-Walloc-size-larger-than=]" }