Fix braino in parallel move resolver.

Reiterating over the moves needs to set i to -1, not 0.

bug:26241132

Change-Id: Iaae7eac5b421b0ee1b1ce89577c8b951b2d4dae8
diff --git a/compiler/optimizing/parallel_move_resolver.cc b/compiler/optimizing/parallel_move_resolver.cc
index 30bcf19..176c50c 100644
--- a/compiler/optimizing/parallel_move_resolver.cc
+++ b/compiler/optimizing/parallel_move_resolver.cc
@@ -169,7 +169,7 @@
         // If `other_move` was swapped, we iterate again to find a new
         // potential cycle.
         required_swap = nullptr;
-        i = 0;
+        i = -1;
       } else if (required_swap != nullptr) {
         // A move is required to swap. We walk back the cycle to find the
         // move by just returning from this `PerforrmMove`.