S390: Guard RISBG usage with facility check

src/crankshaft/s390/lithium-codegen-s390.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/s390/lithium-codegen-s390.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 4211 matching lines @@
     LConstantOperand* const_operand = LConstantOperand::cast(instr->key());
     offset += ToInteger32(const_operand) * kPointerSize;
   } else {
     // Even though the HLoadKeyed instruction forces the input
     // representation for the key to be an integer, the input gets replaced
     // during bound check elimination with the index argument to the bounds
     // check, which can be tagged, so that case must be handled here, too.
     if (hinstr->key()->representation().IsSmi()) {
       __ SmiToPtrArrayOffset(scratch, key);
     } else {
-      if (instr->hydrogen()->IsDehoisted()) {
+      if (instr->hydrogen()->IsDehoisted() ||
+          !CpuFeatures::IsSupported(GENERAL_INSTR_EXT)) {
 #if V8_TARGET_ARCH_S390X
         // If array access is dehoisted, the key, being an int32, can contain
         // a negative value, as needs to be sign-extended to 64-bit for
         // memory access.
         __ lgfr(key, key);
 #endif
         __ ShiftLeftP(scratch, key, Operand(kPointerSizeLog2));
       } else {
         // Small optimization to reduce pathlength.  After Bounds Check,
         // the key is guaranteed to be non-negative.  Leverage RISBG,
@@ skipping 1418 matching lines @@
   __ LoadP(result,
            FieldMemOperand(scratch, FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8