Core 624/N2932: Throw bad_array_new_length on overflow

Core 624/N2932: Throw bad_array_new_length on overflow
	in array new size calculation.

libstdc++-v3/
	* libsupc++/new: Add std::bad_array_new_length.
	* libsupc++/bad_array_new.cc: New.
	* libsupc++/eh_aux_runtime.cc: Add __cxa_throw_bad_array_new_length.
	* libsupc++/Makefile.in: Build them.
	* config/abi/pre/gnu.ver: Add new symbols.
	* config/abi/pre/gnu-versioned-namespace.ver: Add new symbols.
gcc/cp/
	* init.c (throw_bad_array_new_length): New.
	(build_new_1): Use it.  Don't warn about braced-init-list.
	(build_vec_init): Use it.
	* call.c (build_operator_new_call): Use it.

From-SVN: r198731