Add support in altivec.h for the following functions, as well as matching builtins:

vector unsigned long long vec_extract_exp (vector double);

vector unsigned int vec_extract_exp (vector float);

vector unsigned long long vec_extract_sig (vector double)

vector unsigned int vec_extract_sig (vector float)

Add builtins mapping to the vector float/vector double 'test data class' instructions, as well as a function like macro that will expand to the equivalent of either:

vector bool int vec_test_data_class (vector float, const int);

vector bool long long vec_test_data_class (vector double, const int);

as well as defines for all the masks used as the second argument to vec_test_data_class.