[Bug libgcc/56846] _Unwind_Backtrace on ARM and noexcept

["tony.wang at arm dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56846

--- Comment #7 from wangzheyu <tony.wang at arm dot com> ---
Another test case doesn't involve noexcept key workd.

Cmd line: arm-none-eabi-g++ -mthumb -mcpu=cortex-m3 -O0 -g -std=c++11
-specs=rdimon.specs main.c -o main.exe

#include <unwind.h>
#include <stdio.h>
_Unwind_Reason_Code trace_func(struct _Unwind_Context * context, void* arg) {
  void *ip = (void *)_Unwind_GetIP(context);
  printf("Address: %p\n", ip);
  return _URC_NO_REASON;
}
void bar()
{
        puts("This is in bar");
        _Unwind_Backtrace((_Unwind_Trace_Fn)&trace_func, 0);
}
void foo()
{
  try
  {
    bar();
  }
  catch (...)
  {
    puts("Exception");
  }
}