[cfe-commits] Better const_cast support

[Sebastian Redl]

Hi,

The attached patch adds validation to const_cast, to ensure that it only 
performs casts that the standard allows. With this, const_cast is 
compliant except that it does not reject pointers to (member) functions yet.

Piggybacking are a comment change where a standard reference incorrectly 
says C99 instead of C++ and a correction of an assertion that contained 
a tautological condition.

Next I'll take a closer look at the beast that makes
int i;
const int &ri = i;
fail to compile :-)

Sebastian
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