MIPS: Reland of `Fix bad RegisterConfiguration usage in InstructionSequence unit tests`

test/unittests/compiler/instruction-sequence-unittest.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 "src/base/utils/random-number-generator.h"
 #include "src/compiler/pipeline.h"
 #include "test/unittests/compiler/instruction-sequence-unittest.h"
 #include "test/unittests/test-utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
@@ skipping 67 matching lines @@
       return config()->GetAllocatableFloatCode(index);
     case MachineRepresentation::kFloat64:
       return config()->GetAllocatableDoubleCode(index);
     case MachineRepresentation::kSimd128:
       return config()->GetAllocatableSimd128Code(index);
     default:
       return config()->GetAllocatableGeneralCode(index);
   }
 }
 
-RegisterConfiguration* InstructionSequenceTest::config() {
+const RegisterConfiguration* InstructionSequenceTest::config() {
   if (!config_) {
     config_.reset(new RegisterConfiguration(
         num_general_registers_, num_double_registers_, num_general_registers_,
         num_double_registers_, allocatable_codes, allocatable_codes,
         kSimpleFPAliasing ? RegisterConfiguration::OVERLAP
                           : RegisterConfiguration::COMBINE,
         general_register_names_,
         double_register_names_,  // float register names
         double_register_names_,
         double_register_names_));  // SIMD 128 register names
   }
   return config_.get();
 }
 
 
 InstructionSequence* InstructionSequenceTest::sequence() {
   if (sequence_ == nullptr) {
     sequence_ = new (zone())
         InstructionSequence(isolate(), zone(), &instruction_blocks_);
+    sequence_->SetRegisterConfigurationForTesting(
+        InstructionSequenceTest::config());
   }
   return sequence_;
 }
 
 
 void InstructionSequenceTest::StartLoop(int loop_blocks) {
   CHECK(current_block_ == nullptr);
   if (!loop_blocks_.empty()) {
     CHECK(!loop_blocks_.back().loop_header_.IsValid());
   }
@@ skipping 437 matching lines @@
 
 
 Instruction* InstructionSequenceTest::AddInstruction(Instruction* instruction) {
   sequence()->AddInstruction(instruction);
   return instruction;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8