[Turbofan] Simplify operand canonicalization on archs with simple FP aliasing.

src/compiler/move-optimizer.cc

Index: src/compiler/move-optimizer.cc
diff --git a/src/compiler/move-optimizer.cc b/src/compiler/move-optimizer.cc
index 50516c123989f63bdd6e42e639b09f0e85bae64c..4753d15979a99fcb0f39e59db9ab3f6a1d979938 100644
--- a/src/compiler/move-optimizer.cc
+++ b/src/compiler/move-optimizer.cc
@@ -29,8 +29,8 @@ typedef ZoneSet<InstructionOperand, CompareOperandModuloType> OperandSet;
 
 bool Blocks(const OperandSet& set, const InstructionOperand& operand) {
   if (set.find(operand) != set.end()) return true;
-  // Only FP registers alias.
-  if (!operand.IsFPRegister()) return false;
+  // Only FP registers on archs with non-simple aliasing need extra checks.
+  if (!operand.IsFPRegister() || kSimpleFPAliasing) return false;
 
   const LocationOperand& loc = LocationOperand::cast(operand);
   MachineRepresentation rep = loc.representation();