[PATCH, rs6000] improve vec_ctf invalid parameter handling.

[PATCH, rs6000] improve vec_ctf invalid parameter handling.

Hi,
  Per PR91903, GCC ICEs when we attempt to pass a variable
(or out of range value) into the vec_ctf() builtin.  Per
investigation, the parameter checking exists for this
builtin with the int types, but was missing for
the long long types. This problem also occurs for the
vec_cts() builtin, which is also fixed by this patch.

This patch adds the missing CODE_FOR_* entries to the
rs6000_expand_binup_builtin to cover that scenario.
This patch also updates some existing tests to remove
calls to vec_ctf() and vec_cts() that contain negative
values.

PR target/91903

2020-01-29  Will Schmidt  <will_schmidt@vnet.ibm.com>

gcc/ChangeLog:
	* config/rs6000/rs6000-call.c (rs6000_expand_binup_builtin): Add
	clauses for CODE_FOR_vsx_xvcvuxddp_scale and
	CODE_FOR_vsx_xvcvsxddp_scale to the parameter checking code.

gcc/testsuite/ChangeLog:
	* gcc.target/powerpc/pr91903.c: New test.
	* gcc.target/powerpc/builtins-1.fold.h: Update.
	* gcc.target/powerpc/builtins-2.c: Update.