[PATCH] Throw std::bad_array_new_length as expected

[Aaron Ballman]

[expr.new]p7 states (in part):

... If the expression, after converting to std::size_t, is a core
constant expression and the expression is erroneous, the program is
ill-formed. Otherwise, a new-expression with an erroneous expression
does not call an allocation function and terminates by throwing an
exception of a type that would match a handler (15.3) of type
std::bad_array_new_length (18.6.2.2). ...

This patch implements support for throwing that exception, at least
with the Itanium ABI. It calls out that the Microsoft ABI does not
currently implement this functionality, but there's a test in place
which we can fix when we get around to better MS support for this.

~Aaron
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