This patch implements builtins for the following prototypes:

vector signed char vec_sldb (vector signed char, vector signed char, const unsigned int);

vector unsigned char vec_sldb (vector unsigned char, vector unsigned char, const unsigned int);

vector signed short vec_sldb (vector signed short, vector signed short, const unsigned int);

vector unsigned short vec_sldb (vector unsigned short, vector unsigned short, const unsigned int);

vector signed int vec_sldb (vector signed int, vector signed int, const unsigned int);

vector unsigned int vec_sldb (vectoextracthr unsigned int, vector unsigned int, const unsigned int);

vector signed long long vec_sldb (vector signed long long, vector signed long long, const unsigned int);

vector unsigned long long vec_sldb (vector unsigned long long, vector unsigned long long, const unsigned int);

vector signed char vec_srdb (vector signed char, vector signed char, const unsigned int);

vector unsigned char vec_srdb (vector unsigned char, vector unsigned char, const unsigned int);

vector signed short vec_srdb (vector signed short, vector signed short, const unsigned int);

vector unsigned short vec_srdb (vector unsigned short, vector unsigned short, const unsigned int);

vector signed int vec_srdb (vector signed int, vector signed int, const unsigned int);

vector unsigned int vec_srdb (vector unsigned int, vector unsigned int, const unsigned int);

vector signed long long vec_srdb (vector signed long long, vector signed long long, const unsigned int);extracth

vector unsigned long long vec_srdb (vector unsigned long long, vector unsigned long long, const unsigned int);