[turbofan] simplify gap ordering

test/cctest/compiler/test-jump-threading.cc

Index: test/cctest/compiler/test-jump-threading.cc
diff --git a/test/cctest/compiler/test-jump-threading.cc b/test/cctest/compiler/test-jump-threading.cc
index b40023cfbb89bc997147e60cf5d6b29c91ef2c8d..d9825033ebe8c0b73f812b175a162718606e0fd3 100644
--- a/test/cctest/compiler/test-jump-threading.cc
+++ b/test/cctest/compiler/test-jump-threading.cc
@@ -60,14 +60,14 @@ class TestCode : public HandleAndZoneScope {
   void RedundantMoves() {
     Start();
     sequence_.AddInstruction(Instruction::New(main_zone(), kArchNop));
-    int index = static_cast<int>(sequence_.instructions().size()) - 1;
+    int index = static_cast<int>(sequence_.instructions().size()) - 2;
     sequence_.AddGapMove(index, RegisterOperand::Create(13, main_zone()),
                          RegisterOperand::Create(13, main_zone()));
   }
   void NonRedundantMoves() {
     Start();
     sequence_.AddInstruction(Instruction::New(main_zone(), kArchNop));
-    int index = static_cast<int>(sequence_.instructions().size()) - 1;
+    int index = static_cast<int>(sequence_.instructions().size()) - 2;
     sequence_.AddGapMove(index, ImmediateOperand::Create(11, main_zone()),
                          RegisterOperand::Create(11, main_zone()));
   }