8269580: assert(is_valid()) failed: invalid register (-1)

Reviewed-by: kvn, dlong

Author: Jatin Bhateja

src/hotspot/cpu/x86/x86_32.ad

@@ -11471,7 +11471,7 @@ instruct MoveL2D_reg_reg_sse(regD dst, eRegL src, regD tmp) %{
 // Small ClearArray non-AVX512.
 instruct rep_stos(eCXRegI cnt, eDIRegP base, regD tmp, eAXRegI zero, Universe dummy, eFlagsReg cr) %{
   predicate(!((ClearArrayNode*)n)->is_large() &&
-              (UseAVX <= 2 || !VM_Version::supports_avx512vlbw()));
+              (UseAVX <= 2));
   match(Set dummy (ClearArray cnt base));
   effect(USE_KILL cnt, USE_KILL base, TEMP tmp, KILL zero, KILL cr);
 
@@ -11532,7 +11532,7 @@ instruct rep_stos(eCXRegI cnt, eDIRegP base, regD tmp, eAXRegI zero, Universe du
 // Small ClearArray AVX512 non-constant length.
 instruct rep_stos_evex(eCXRegI cnt, eDIRegP base, regD tmp, kReg ktmp, eAXRegI zero, Universe dummy, eFlagsReg cr) %{
   predicate(!((ClearArrayNode*)n)->is_large() &&
-               UseAVX > 2 && VM_Version::supports_avx512vlbw() &&
+               UseAVX > 2 &&
                !n->in(2)->bottom_type()->is_int()->is_con());
   match(Set dummy (ClearArray cnt base));
   effect(USE_KILL cnt, USE_KILL base, TEMP tmp, TEMP ktmp, KILL zero, KILL cr);

src/hotspot/cpu/x86/x86_64.ad

@@ -11024,7 +11024,7 @@ instruct rep_stos(rcx_RegL cnt, rdi_RegP base, regD tmp, rax_RegI zero,
                   Universe dummy, rFlagsReg cr)
 %{
   predicate(!((ClearArrayNode*)n)->is_large() &&
-              (UseAVX <= 2 || !VM_Version::supports_avx512vlbw()));
+              (UseAVX <= 2));
   match(Set dummy (ClearArray cnt base));
   effect(USE_KILL cnt, USE_KILL base, TEMP tmp, KILL zero, KILL cr);
 
@@ -11085,7 +11085,7 @@ instruct rep_stos_evex(rcx_RegL cnt, rdi_RegP base, regD tmp, kReg ktmp, rax_Reg
                        Universe dummy, rFlagsReg cr)
 %{
   predicate(!((ClearArrayNode*)n)->is_large() &&
-               UseAVX > 2 && VM_Version::supports_avx512vlbw() &&
+               UseAVX > 2 &&
                !n->in(2)->bottom_type()->is_long()->is_con());
   match(Set dummy (ClearArray cnt base));
   effect(USE_KILL cnt, USE_KILL base, TEMP tmp, TEMP ktmp, KILL zero, KILL cr);