extend.texi: Update the built-in documentation file for the existing built-in functio...

extend.texi: Update the built-in documentation file for the existing built-in functions...

gcc/ChangeLog:

2017-07-25  Carl Love  <cel@us.ibm.com>

	* doc/extend.texi: Update the built-in documentation file for the
	existing built-in functions
	vector signed char vec_cnttz (vector signed char);
	vector unsigned char vec_cnttz (vector unsigned char);
	vector signed short vec_cnttz (vector signed short);
	vector unsigned short vec_cnttz (vector unsigned short);
	vector signed int vec_cnttz (vector signed int);
	vector unsigned int vec_cnttz (vector unsigned int);
	vector signed long long vec_cnttz (vector signed long long);
	vector unsigned long long vec_cnttz (vector unsigned long long);

gcc/testsuite/ChangeLog:

2017-07-25  Carl Love  <cel@us.ibm.com>

	* gcc.target/powerpc/builtins-4-p9-runnable.c:  Add test file for
	vec_cnttz builtins.

From-SVN: r250549