Change the register allocator so that it no longer tracks references...

src/ia32/jump-target-ia32.cc

Index: src/ia32/jump-target-ia32.cc
===================================================================
--- src/ia32/jump-target-ia32.cc	(revision 2055)
+++ src/ia32/jump-target-ia32.cc	(working copy)
@@ -84,7 +84,7 @@
     // branch.
     VirtualFrame* fall_through_frame = cgen()->frame();
     VirtualFrame* branch_frame = new VirtualFrame(fall_through_frame);
-    RegisterFile non_frame_registers = RegisterAllocator::Reserved();
+    RegisterFile non_frame_registers;
     cgen()->SetFrame(branch_frame, &non_frame_registers);
 
     // Check if we can avoid merge code.
@@ -179,14 +179,14 @@
     ASSERT(reaching_frames_.is_empty());
     ASSERT(!cgen()->has_valid_frame());
 
-    RegisterFile reserved = RegisterAllocator::Reserved();
+    RegisterFile empty;
     if (direction_ == BIDIRECTIONAL) {
       // Copy the entry frame so the original can be used for a
       // possible backward jump.
-      cgen()->SetFrame(new VirtualFrame(entry_frame_), &reserved);
+      cgen()->SetFrame(new VirtualFrame(entry_frame_), &empty);
     } else {
       // Take ownership of the entry frame.
-      cgen()->SetFrame(entry_frame_, &reserved);
+      cgen()->SetFrame(entry_frame_, &empty);
       entry_frame_ = NULL;
     }
     __ bind(&entry_label_);
@@ -200,8 +200,7 @@
       // The stack pointer can be floating above the top of the
       // virtual frame before the bind.  Afterward, it should not.
       VirtualFrame* frame = cgen()->frame();
-      int difference =
-          frame->stack_pointer_ - (frame->elements_.length() - 1);
+      int difference = frame->stack_pointer_ - (frame->element_count() - 1);
       if (difference > 0) {
         frame->stack_pointer_ -= difference;
         __ add(Operand(esp), Immediate(difference * kPointerSize));
@@ -225,15 +224,14 @@
     // possible backward jumps.  Pick up the only reaching frame, take
     // ownership of it, and use it for the block about to be emitted.
     VirtualFrame* frame = reaching_frames_[0];
-    RegisterFile reserved = RegisterAllocator::Reserved();
-    cgen()->SetFrame(frame, &reserved);
+    RegisterFile empty;
+    cgen()->SetFrame(frame, &empty);
     reaching_frames_[0] = NULL;
     __ bind(&merge_labels_[0]);
 
     // The stack pointer can be floating above the top of the
     // virtual frame before the bind.  Afterward, it should not.
-    int difference =
-        frame->stack_pointer_ - (frame->elements_.length() - 1);
+    int difference = frame->stack_pointer_ - (frame->element_count() - 1);
     if (difference > 0) {
       frame->stack_pointer_ -= difference;
       __ add(Operand(esp), Immediate(difference * kPointerSize));
@@ -291,11 +289,11 @@
           }
           // Pick up the frame for this block.  Assume ownership if
           // there cannot be backward jumps.
-          RegisterFile reserved = RegisterAllocator::Reserved();
+          RegisterFile empty;
           if (direction_ == BIDIRECTIONAL) {
-            cgen()->SetFrame(new VirtualFrame(frame), &reserved);
+            cgen()->SetFrame(new VirtualFrame(frame), &empty);
           } else {
-            cgen()->SetFrame(frame, &reserved);
+            cgen()->SetFrame(frame, &empty);
             reaching_frames_[i] = NULL;
           }
           __ bind(&merge_labels_[i]);
@@ -318,8 +316,8 @@
           // If this is the fall through frame, and it didn't need
           // merge code, we need to pick up the frame so we can jump
           // around subsequent merge blocks if necessary.
-          RegisterFile reserved = RegisterAllocator::Reserved();
-          cgen()->SetFrame(frame, &reserved);
+          RegisterFile empty;
+          cgen()->SetFrame(frame, &empty);
           reaching_frames_[i] = NULL;
         }
       }
@@ -329,8 +327,8 @@
     // fall through and none of the reaching frames needed merging.
     // In that case, clone the entry frame as the current frame.
     if (!cgen()->has_valid_frame()) {
-      RegisterFile reserved_registers = RegisterAllocator::Reserved();
-      cgen()->SetFrame(new VirtualFrame(entry_frame_), &reserved_registers);
+      RegisterFile empty;
+      cgen()->SetFrame(new VirtualFrame(entry_frame_), &empty);
     }
 
     // There may be unprocessed reaching frames that did not need
@@ -355,8 +353,8 @@
 
     // Use a copy of the reaching frame so the original can be saved
     // for possible reuse as a backward merge block.
-    RegisterFile reserved = RegisterAllocator::Reserved();
-    cgen()->SetFrame(new VirtualFrame(reaching_frames_[0]), &reserved);
+    RegisterFile empty;
+    cgen()->SetFrame(new VirtualFrame(reaching_frames_[0]), &empty);
     __ bind(&merge_labels_[0]);
     cgen()->frame()->MergeTo(entry_frame_);
   }