[cfe-commits] Better const_cast support

[Sebastian Redl]

Updated patch. Supports arrays and function pointers the same way as GCC 
(as near as I can determine).

What it does not support is array decay. This fails:

const int ar[100];
int *pi = const_cast<int*>(ar);

This is because lvalue-to-rvalue conversion is not performed on the 
argument (would lead to array decay). Is a generic facility for this in 
the semantic checker somewhere? It's really indispensable for C++ 
semantic checking.

The test case will now fail because I've put the above in it. I think 
it's better to have a failing test than to know there's a missing 
feature but eventually forget about it.

Sebastian
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