[Bug target/80376] Some vec_xxpermdi usage lead to ICE

["wschmidt at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80376

--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Patch under test would produce the follow errors instead:

wschmidt@pike:~/src$ $GCC_INSTALL/bin/gcc pr80376.c 
pr80376.c: In function 'main':
pr80376.c:12:5: error: argument 3 must be a 2-bit unsigned literal
     vec_vsx_st(vec_xxpermdi(a, b, j), 0, c);
     ^~~~~~~~~~
pr80376.c:12:5: internal compiler error: non-vector constant found where vector
expected
0x116cde0b gen_movv4si(rtx_def*, rtx_def*)
        /home/wschmidt/gcc/gcc-mainline-test/gcc/config/rs6000/vector.md:114
0x105fd113 insn_gen_fn::operator()(rtx_def*, rtx_def*) const
        /home/wschmidt/gcc/gcc-mainline-test/gcc/recog.h:301
0x1077a497 emit_move_insn_1(rtx_def*, rtx_def*)
        /home/wschmidt/gcc/gcc-mainline-test/gcc/expr.c:3643
0x1077ab37 emit_move_insn(rtx_def*, rtx_def*)
        /home/wschmidt/gcc/gcc-mainline-test/gcc/expr.c:3738
0x107826d3 store_expr_with_bounds(tree_node*, rtx_def*, int, bool, bool,
tree_node*)
        /home/wschmidt/gcc/gcc-mainline-test/gcc/expr.c:5729
0x107802a3 expand_assignment(tree_node*, tree_node*, bool)
        /home/wschmidt/gcc/gcc-mainline-test/gcc/expr.c:5321
0x1056ec0b expand_call_stmt
        /home/wschmidt/gcc/gcc-mainline-test/gcc/cfgexpand.c:2656
0x10572b87 expand_gimple_stmt_1
        /home/wschmidt/gcc/gcc-mainline-test/gcc/cfgexpand.c:3571
0x105734c3 expand_gimple_stmt
        /home/wschmidt/gcc/gcc-mainline-test/gcc/cfgexpand.c:3737
0x1057cd03 expand_gimple_basic_block
        /home/wschmidt/gcc/gcc-mainline-test/gcc/cfgexpand.c:5744
0x1057ef3b execute
        /home/wschmidt/gcc/gcc-mainline-test/gcc/cfgexpand.c:6357
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