Reduce the memory used by frame elements from two words to one by...

src/virtual-frame.cc

Index: src/virtual-frame.cc
===================================================================
--- src/virtual-frame.cc	(revision 1947)
+++ src/virtual-frame.cc	(working copy)
@@ -94,10 +94,10 @@
     case FrameElement::REGISTER:
       // All copies are backed by memory or register locations.
       result.set_static_type(target.static_type());
-      result.type_ = FrameElement::COPY;
-      result.copied_ = false;
-      result.synced_ = false;
-      result.data_.index_ = index;
+      result.set_type(FrameElement::COPY);
+      result.clear_copied();
+      result.clear_sync();
+      result.set_index(index);
       elements_[index].set_copied();
       break;
 
@@ -465,23 +465,6 @@
 }
 
 
-bool FrameElement::Equals(FrameElement other) {
-  if (type_ != other.type_ ||
-      copied_ != other.copied_ ||
-      synced_ != other.synced_) return false;
-
-  if (is_register()) {
-    if (!reg().is(other.reg())) return false;
-  } else if (is_constant()) {
-    if (!handle().is_identical_to(other.handle())) return false;
-  } else if (is_copy()) {
-    if (index() != other.index()) return false;
-  }
-
-  return true;
-}
-
-
 bool VirtualFrame::Equals(VirtualFrame* other) {
 #ifdef DEBUG
   // These are sanity checks in debug builds, but we do not need to