S390 [Crankshaft]: Use LoadPositive for MathAbs

src/s390/assembler-s390.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 991 matching lines @@
 //    0        8         16   20            32   36   40      47
 #define SIY_FORM_EMIT(name, op)                                     \
   void Assembler::name(const Operand& i2, Register b1, Disp d1) {   \
     siy_form(op, i2, b1, d1);                                       \
   }                                                                 \
   void Assembler::name(const MemOperand& opnd, const Operand& i2) { \
     name(i2, opnd.getBaseRegister(), opnd.getDisplacement());       \
   }
 
 void Assembler::siy_form(Opcode op, const Operand& i2, Register b1, Disp d1) {
-  DCHECK(is_uint20(d1));
+  DCHECK(is_uint20(d1) || is_int20(d1));
   DCHECK(is_uint16(op));
   DCHECK(is_uint8(i2.imm_));
   uint64_t code = (static_cast<uint64_t>(op & 0xFF00)) * B32 |
                   (static_cast<uint64_t>(i2.imm_)) * B32 |
                   (static_cast<uint64_t>(b1.code())) * B28 |
                   (static_cast<uint64_t>(d1 & 0x0FFF)) * B16 |
                   (static_cast<uint64_t>(d1 & 0x0FF000)) >> 4 |
                   (static_cast<uint64_t>(op & 0x00FF));
   emit6bytes(code);
 }
@@ skipping 1598 matching lines @@
                             SKIP_ICACHE_FLUSH);
     }
 
     reloc_info_writer.Write(&rinfo);
   }
 }
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_TARGET_ARCH_S390