rs6000-c.c: Add built-in support for vector float vec_pack (vector double...

rs6000-c.c: Add built-in support for vector float vec_pack (vector double...

gcc/ChangeLog:

2016-12-13  Carl Love  <cel@us.ibm.com>

   * config/rs6000/rs6000-c.c: Add built-in support for
   vector float vec_pack (vector double, vector double)
   vector double vec_sld (vector double, vector double)
   * config/rs6000/rs6000.c: Add icode check for vsldoi_v2df to allow
   4-bit unsigned literal.
   * config/rs6000/rs6000-builtin.def: Add definition for VSLDOI_2DF
   * doc/extend.texi: Update the built-in documentation file for the
   new powerpc vec_pack and vec_sld built-ins.

gcc/testsuite/ChangeLog:

2016-12-13 Carl Love  <cel@us.ibm.com>

	* gcc.target/powerpc/builtins-3.c: Add new test of the test suite
	file.
	* gcc.target/powerpc/builtins-3-p8.c: Add new test of the test suite
	file.

From-SVN: r243612