Fix debug mode test failures on MIPS and PPC after f1aa5562.

test/unittests/compiler/move-optimizer-unittest.cc

Index: test/unittests/compiler/move-optimizer-unittest.cc
diff --git a/test/unittests/compiler/move-optimizer-unittest.cc b/test/unittests/compiler/move-optimizer-unittest.cc
index c7c92a0321baa1c75ff383826706bb84f26da8ef..9a31d2f770753d3bc17f318431cfb2b09df83b05 100644
--- a/test/unittests/compiler/move-optimizer-unittest.cc
+++ b/test/unittests/compiler/move-optimizer-unittest.cc
@@ -104,11 +104,18 @@ TEST_F(MoveOptimizerTest, RemovesRedundant) {
 
 
 TEST_F(MoveOptimizerTest, RemovesRedundantExplicit) {
+  int first_reg_index =
+      RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN)
+          ->GetAllocatableGeneralCode(0);
+  int second_reg_index =
+      RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN)
+          ->GetAllocatableGeneralCode(1);
+
   StartBlock();
   auto first_instr = EmitNop();
-  AddMove(first_instr, Reg(0), ExplicitReg(1));
+  AddMove(first_instr, Reg(first_reg_index), ExplicitReg(second_reg_index));
   auto last_instr = EmitNop();
-  AddMove(last_instr, Reg(1), Reg(0));
+  AddMove(last_instr, Reg(second_reg_index), Reg(first_reg_index));
   EndBlock(Last());
 
   Optimize();
@@ -116,7 +123,7 @@ TEST_F(MoveOptimizerTest, RemovesRedundantExplicit) {
   CHECK_EQ(0, NonRedundantSize(first_instr->parallel_moves()[0]));
   auto move = last_instr->parallel_moves()[0];
   CHECK_EQ(1, NonRedundantSize(move));
-  CHECK(Contains(move, Reg(0), ExplicitReg(1)));
+  CHECK(Contains(move, Reg(first_reg_index), ExplicitReg(second_reg_index)));
 }