Remove the first_right_arg hack for HMod.

src/arm/lithium-codegen-arm.cc

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1115 matching lines @@
       __ rsb(result_reg, result_reg, Operand::Zero(), SetCC);
       if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
         DeoptimizeIf(eq, instr->environment());
       }
       __ b(&done);
     }
 
     __ bind(&left_is_not_negative);
     __ and_(result_reg, left_reg, Operand(divisor - 1));
     __ bind(&done);
-
-  } else if (hmod->fixed_right_arg().has_value) {
-    Register left_reg = ToRegister(instr->left());
-    Register right_reg = ToRegister(instr->right());
-    Register result_reg = ToRegister(instr->result());
-
-    int32_t divisor = hmod->fixed_right_arg().value;
-    ASSERT(IsPowerOf2(divisor));
-
-    // Check if our assumption of a fixed right operand still holds.
-    __ cmp(right_reg, Operand(divisor));
-    DeoptimizeIf(ne, instr->environment());
-
-    Label left_is_not_negative, done;
-    if (left->CanBeNegative()) {
-      __ cmp(left_reg, Operand::Zero());
-      __ b(pl, &left_is_not_negative);
-      __ rsb(result_reg, left_reg, Operand::Zero());
-      __ and_(result_reg, result_reg, Operand(divisor - 1));
-      __ rsb(result_reg, result_reg, Operand::Zero(), SetCC);
-      if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
-        DeoptimizeIf(eq, instr->environment());
-      }
-      __ b(&done);
-    }
-
-    __ bind(&left_is_not_negative);
-    __ and_(result_reg, left_reg, Operand(divisor - 1));
-    __ bind(&done);
-
   } else if (CpuFeatures::IsSupported(SUDIV)) {
     CpuFeatureScope scope(masm(), SUDIV);
 
     Register left_reg = ToRegister(instr->left());
     Register right_reg = ToRegister(instr->right());
     Register result_reg = ToRegister(instr->result());
 
     Label done;
     // Check for x % 0, sdiv might signal an exception. We have to deopt in this
     // case because we can't return a NaN.
@@ skipping 4757 matching lines @@
   __ sub(scratch, result, Operand::PointerOffsetFromSmiKey(index));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal