[rs6000] mmintrin.h: fix use of "vector"

A recent patch inadvertently added the use of "vector" to mmintrin.h
when all such uses should be "__vector".

[gcc]

2018-12-07  Paul A. Clarke  <pc@us.ibm.com>

	PR target/88408
	* config/rs6000/mmintrin.h (_mm_packs_pu16): Correctly use "__vector".

From-SVN: r266895

gcc/ChangeLog

+2018-12-07  Paul A. Clarke  <pc@us.ibm.com>
+
+	PR target/88408
+	* config/rs6000/mmintrin.h (_mm_packs_pu16): Correctly use "__vector".
+
 2018-12-07  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/88349

gcc/config/rs6000/mmintrin.h

@@ -228,9 +228,9 @@ _mm_packs_pu16 (__m64 __m1, __m64 __m2)
 #endif
   const __vector signed short __zero = { 0 };
   __vector __bool short __select = vec_cmplt (vm1, __zero);
-  r = vec_packs ((vector unsigned short) vm1, (vector unsigned short) vm1);
+  r = vec_packs ((__vector unsigned short) vm1, (__vector unsigned short) vm1);
   __vector __bool char packsel = vec_pack (__select, __select);
-  r = vec_sel (r, (const vector unsigned char) __zero, packsel);
+  r = vec_sel (r, (const __vector unsigned char) __zero, packsel);
   return (__m64) ((__vector long long) r)[0];
 }