S390X: [turbofan] Fix checked loads/stores.

src/s390/macro-assembler-s390.h

 // 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.
 
 #ifndef V8_S390_MACRO_ASSEMBLER_S390_H_
 #define V8_S390_MACRO_ASSEMBLER_S390_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 394 matching lines @@
   void Popcnt32(Register dst, Register src);
 
 #ifdef V8_TARGET_ARCH_S390X
   void Popcnt64(Register dst, Register src);
 #endif
 
   void NotP(Register dst);
 
   void mov(Register dst, const Operand& src);
 
+  void CleanUInt32(Register x) {
+#ifdef V8_TARGET_ARCH_S390X
+    llgfr(x, x);
+#endif
+  }
+
   // ---------------------------------------------------------------------------
   // GC Support
 
   void IncrementalMarkingRecordWriteHelper(Register object, Register value,
                                            Register address);
 
   enum RememberedSetFinalAction { kReturnAtEnd, kFallThroughAtEnd };
 
   // Record in the remembered set the fact that we have a pointer to new space
   // at the address pointed to by the addr register.  Only works if addr is not
@@ skipping 1457 matching lines @@
 #define ACCESS_MASM(masm)    \
   masm->stop(__FILE_LINE__); \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_S390_MACRO_ASSEMBLER_S390_H_