[C++] Deprecating -fno-for-scope for 3.5.0

[Andrew Pinski]

It has been a long time since this option was added to support old ARM 
C++ code.
I think it is time to remove it, people had a large amount of time to 
fix their
code.  This option has been here since 2.7.1 which was back in 1995 so 
almost
ten years.  We only get one or two bug reports about this flag and 
libstdc++ per
release which I think is a maintainer burden.

Does anyone have any objections?

Thanks,
Andrew Pinski