[C++ Patch] PR 16603

[Paolo Carlini]

Hi,

in the audit trail of this *old* PR, which is about the miscompilation of:

char const c = 'q';

enum
   {
     x = c,
     y = sizeof(x)
   };

int test[y == sizeof(char) ? 1 : -1];

Andrew noticed that the problem is in the perform_integral_promotions 
call at the beginning of build_enumerator. Now, the "funny" thing is, I 
don't see why we should be calling it at all! Thus I applied the below 
and booted it all languages (minus Ada) on x86_64-linux multilib and 
tested C/C++ (the other languages in progress). Can you imagine a reason 
why it may not be Ok?

Thanks,
Paolo.

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