s390: remove redundant instr in loadrepresentation

src/s390/macro-assembler-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 <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/base/bits.h"
@@ skipping 3114 matching lines @@
 // This should really move to be in macro-assembler as it
 // is really a pseudo instruction
 // Some usages of this intend for a FIXED_SEQUENCE to be used
 // @TODO - break this dependency so we can optimize mov() in general
 // and only use the generic version when we require a fixed sequence
 void MacroAssembler::LoadRepresentation(Register dst, const MemOperand& mem,
                                         Representation r, Register scratch) {
   DCHECK(!r.IsDouble());
   if (r.IsInteger8()) {
     LoadB(dst, mem);
-    lgbr(dst, dst);
   } else if (r.IsUInteger8()) {
     LoadlB(dst, mem);
   } else if (r.IsInteger16()) {
     LoadHalfWordP(dst, mem, scratch);
-    lghr(dst, dst);
   } else if (r.IsUInteger16()) {
     LoadHalfWordP(dst, mem, scratch);
 #if V8_TARGET_ARCH_S390X
   } else if (r.IsInteger32()) {
     LoadW(dst, mem, scratch);
 #endif
   } else {
     LoadP(dst, mem, scratch);
   }
 }
@@ skipping 1990 matching lines @@
   }
   if (mag.shift > 0) ShiftRightArith(result, result, Operand(mag.shift));
   ExtractBit(r0, dividend, 31);
   AddP(result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390