ARM64: Regenerate instead of spilling and restoring cheap lithium instructions.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index e7ef516fbc9f86708b5dd353e1ccda0919536ea8..eef57a8ae892739b2ae3b9c02795ad503ac74eb1 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -369,6 +369,16 @@ void HUseIterator::Advance() {
 }
 
 
+bool HValue::HasPhiUses() const {
+  for (HUseIterator it(uses()); !it.Done(); it.Advance()) {
+    if (it.value()->IsPhi()) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
 int HValue::UseCount() const {
   int count = 0;
   for (HUseIterator it(uses()); !it.Done(); it.Advance()) ++count;