8254814: [Vector API] Fix an AVX512 crash after JDK-8223347

Reviewed-by: vlivanov, thartmann, psandoz

src/hotspot/cpu/x86/x86.ad

@@ -4640,29 +4640,9 @@ instruct reduction64B(rRegI dst, rRegI src1, legVec src2, legVec vtmp1, legVec v
 
 // =======================Short Reduction==========================================
 
-instruct reductionS(rRegI dst, rRegI src1, vec src2, vec vtmp1, vec vtmp2) %{
+instruct reductionS(rRegI dst, rRegI src1, legVec src2, legVec vtmp1, legVec vtmp2) %{
   predicate(vector_element_basic_type(n->in(2)) == T_SHORT &&
-            vector_length(n->in(2)) <= 16); // src2
-  match(Set dst (AddReductionVI src1 src2));
-  match(Set dst (MulReductionVI src1 src2));
-  match(Set dst (AndReductionV  src1 src2));
-  match(Set dst ( OrReductionV  src1 src2));
-  match(Set dst (XorReductionV  src1 src2));
-  match(Set dst (MinReductionV  src1 src2));
-  match(Set dst (MaxReductionV  src1 src2));
-  effect(TEMP vtmp1, TEMP vtmp2);
-  format %{ "vector_reduction_short $dst,$src1,$src2 ; using $vtmp1, $vtmp2 as TEMP" %}
-  ins_encode %{
-    int opcode = this->ideal_Opcode();
-    int vlen = vector_length(this, $src2);
-    __ reduceS(opcode, vlen, $dst$$Register, $src1$$Register, $src2$$XMMRegister, $vtmp1$$XMMRegister, $vtmp2$$XMMRegister);
-  %}
-  ins_pipe( pipe_slow );
-%}
-
-instruct reduction32S(rRegI dst, rRegI src1, legVec src2, legVec vtmp1, legVec vtmp2) %{
-  predicate(vector_element_basic_type(n->in(2)) == T_SHORT &&
-            vector_length(n->in(2)) == 32); // src2
+            vector_length(n->in(2)) <= 32); // src2
   match(Set dst (AddReductionVI src1 src2));
   match(Set dst (MulReductionVI src1 src2));
   match(Set dst (AndReductionV  src1 src2));