[PATCH][no-undefined-overflow] Add basic C++ support

[Joseph S. Myers]

On Fri, 6 Mar 2009, Paolo Bonzini wrote:

> Second, optimizations that require wrapping semantics are still disabled
> with -fno-strict-overflow and require -fwrapv explicitly.  I don't know

These optimizations are of course a key advantage of having explicit tree 
codes, since they can now transform an overflow-undefined operation to an 
overflow-wraps one rather than being disabled altogether without -fwrapv.

-- 
Joseph S. Myers
joseph@codesourcery.com