[gn] Enable stricter build flags

src/compiler/gap-resolver.cc

Index: src/compiler/gap-resolver.cc
diff --git a/src/compiler/gap-resolver.cc b/src/compiler/gap-resolver.cc
index 1ba1044eabf076cba069dfc568113fe2e7687a32..be90a33a21d65fe6753dc6f0c2b0edacaccb1403 100644
--- a/src/compiler/gap-resolver.cc
+++ b/src/compiler/gap-resolver.cc
@@ -148,7 +148,8 @@ void GapResolver::PerformMove(ParallelMove* moves, MoveOperands* move) {
   move->SetPending();
 
   // We may need to split moves between FP locations differently.
-  bool is_fp_loc_move = !kSimpleFPAliasing && destination.IsFPLocationOperand();
+  const bool is_fp_loc_move =
+      !kSimpleFPAliasing && destination.IsFPLocationOperand();
 
   // Perform a depth-first traversal of the move graph to resolve dependencies.
   // Any unperformed, unpending move with a source the same as this one's
@@ -158,7 +159,7 @@ void GapResolver::PerformMove(ParallelMove* moves, MoveOperands* move) {
     if (other->IsEliminated()) continue;
     if (other->IsPending()) continue;
     if (other->source().InterferesWith(destination)) {
-      if (!kSimpleFPAliasing && is_fp_loc_move &&
+      if (is_fp_loc_move &&
           LocationOperand::cast(other->source()).representation() >
               split_rep_) {
         // 'other' must also be an FP location move. Break it into fragments
@@ -213,7 +214,7 @@ void GapResolver::PerformMove(ParallelMove* moves, MoveOperands* move) {
   move->Eliminate();
 
   // Update outstanding moves whose source may now have been moved.
-  if (!kSimpleFPAliasing && is_fp_loc_move) {
+  if (is_fp_loc_move) {
     // We may have to split larger moves.
     for (size_t i = 0; i < moves->size(); ++i) {
       auto other = (*moves)[i];