[Patch] Conversion warnings when truncating 64-bit types (v1)

[Gabriel Dos Reis]

Ian Lance Taylor <iant@google.com> writes:

[...]

| And as Joseph points out, this should work with -Wcoercion.

Indeed, but it needs not be tied to -Wcoercion.  In fact, 
I'm of the opinion that it should be considered independently.
True, -Wcoercion has a broader view but this contribution of Martin is
sufficiently standalone enough.

-- Gaby