[C++ Patch] PR 29273

[Paolo Carlini]

Hi,

in this issue, filed by Martin Sebor and confirmed at the time by the 
EDG people (indeed ICC accepts the testcase), we reject an array as 
source v of a dynamic_cast, because we don't decay it to pointer, as we 
should when T is a pointer type, per 5, p8 in C++03 about an lvalue 
expression as operand of an operator which expects an rvalue (I get 
C++11 as not changing anything in terms of decay, modulo talking about 
glvalue, prvalue, etc).

I also tweaked a bit the code to make sure that in any case we output 
the original v in error messages.

Tested x86_64-linux.

Thanks,
Paolo.

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