ARM: Avoid duplicate vmla when merging vmul and vadd

src/mips/lithium-mips.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/lithium-allocator-inl.h"
 #include "src/mips/lithium-mips.h"
 #include "src/mips/lithium-codegen-mips.h"
 #include "src/hydrogen-osr.h"
@@ skipping 1474 matching lines @@
       right_op = UseRegister(right);
     }
     LMulI* mul = new(zone()) LMulI(left_op, right_op);
     if (can_overflow || bailout_on_minus_zero) {
       AssignEnvironment(mul);
     }
     return DefineAsRegister(mul);
 
   } else if (instr->representation().IsDouble()) {
     if (kArchVariant == kMips32r2) {
-      if (instr->UseCount() == 1 && instr->uses().value()->IsAdd()) {
+      if (instr->HasOneUse() && instr->uses().value()->IsAdd()) {
         HAdd* add = HAdd::cast(instr->uses().value());
         if (instr == add->left()) {
           // This mul is the lhs of an add. The add and mul will be folded
           // into a multiply-add.
           return NULL;
         }
         if (instr == add->right() && !add->left()->IsMul()) {
           // This mul is the rhs of an add, where the lhs is not another mul.
           // The add and mul will be folded into a multiply-add.
           return NULL;
@@ skipping 1030 matching lines @@
 LInstruction* LChunkBuilder::DoAllocateBlockContext(
     HAllocateBlockContext* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
   LOperand* function = UseRegisterAtStart(instr->function());
   LAllocateBlockContext* result =
       new(zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, cp), instr);
 }
 
 } }  // namespace v8::internal