--- old/src/hotspot/cpu/x86/x86.ad	2020-01-10 11:25:17.650687077 -0800
+++ new/src/hotspot/cpu/x86/x86.ad	2020-01-10 11:25:17.462687074 -0800
@@ -2143,7 +2143,7 @@
 
 // Replaces legVec during post-selection cleanup. See above.
 operand legVecZ() %{
-  constraint(ALLOC_IN_RC(vectorz_reg_vl));
+  constraint(ALLOC_IN_RC(vectorz_reg_legacy));
   match(VecZ);
 
   format %{ %}