MIPS: Fix bad RegisterConfiguration usage in InstructionSequence unit tests.

test/unittests/compiler/instruction-sequence-unittest.cc

Index: test/unittests/compiler/instruction-sequence-unittest.cc
diff --git a/test/unittests/compiler/instruction-sequence-unittest.cc b/test/unittests/compiler/instruction-sequence-unittest.cc
index e61f690b4ef29adbb8bd2d0f6306fe9582be7020..9d17c26a5642d9d0efd12d53d01bb19fd742f58a 100644
--- a/test/unittests/compiler/instruction-sequence-unittest.cc
+++ b/test/unittests/compiler/instruction-sequence-unittest.cc
@@ -19,11 +19,6 @@ static const char*
 static char register_names_[10 * (RegisterConfiguration::kMaxGeneralRegisters +
                                   RegisterConfiguration::kMaxFPRegisters)];
 
-namespace {
-static int allocatable_codes[InstructionSequenceTest::kDefaultNRegs] = {
-    0, 1, 2, 3, 4, 5, 6, 7};
-}
-
 static void InitializeRegisterNames() {
   char* loc = register_names_;
   for (int i = 0; i < RegisterConfiguration::kMaxGeneralRegisters; ++i) {
@@ -85,19 +80,8 @@ int InstructionSequenceTest::GetAllocatableCode(int index,
   }
 }
 
-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();
+const RegisterConfiguration* InstructionSequenceTest::config() {
+  return sequence()->GetRegisterConfigurationForTesting();
 }