[cfe-dev] Check improper delete array

[章磊]

Hi Clang,

The attached patch adds a Checker to clang, it checks improper uses of
delete operator(now using delete instead of delete[] to delete an array). I
add poststmt check to VisitCXXNewExpr and prestmt check to
VisitCXXDeleteExpr.

I will appreciate it if there are any advice about this patch.

-- 
Best regards!

Lei Zhang
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