[Bug libstdc++/68276] New: ios_base::_M_grow_words should use new (std::nothrow)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68276

            Bug ID: 68276
           Summary: ios_base::_M_grow_words should use new (std::nothrow)
           Product: gcc
           Version: 5.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

To avoid aborting on allocation failure when the library is compiled with
-fno-exceptions, _M_grow_words should use nothrow new and check for null,
instead of catching std::bad_alloc.