PATCH RFA: C++ frontend: Don't warn about shifts which will not be run

[Jason Merrill]

On 06/12/2009 02:32 PM, Ian Lance Taylor wrote:
> This patch modifies the C++ frontend to not warn about bad shift counts
> for shifts which will never be executed.  It uses the existing
> skip_evaluation global variable.  It sets the variable when parsing ?:
> when the condition is known to be true or false.  It only warns about
> bad shift counts when skip_evaluation is zero.

Hmm...  The use of skip_evaluation in finish_non_static_data_member 
would be incorrect if we start setting it in cases like this.  I think 
this needs a separate flag.

Jason