C, C++: New warning for memset without multiply by elt size

[Bernd Schmidt]

We had this problem in the C frontend until very recently:

   int array[some_count];
   memset (array, 0, some_count);

which forgets to multiply by sizeof int. The following patch implements 
a new warning option for this.

Bootstrapped and tested (a while ago, will retest) on x86_64-linux. Ok 
for trunk?


Bernd
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