Provide baseline GC version.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index b570db9e348d48726ae6cfd2f2aee3e1c2d53c31..1d89e6ab70265ac48170efd4416010bd4173b38f 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -82,6 +82,7 @@ void MarkCompactCollector::CollectGarbage() {
   SweepLargeObjectSpace();
 
   if (IsCompacting()) {
+#ifndef BASELINE_GC
     GCTracer::Scope gc_scope(tracer_, GCTracer::Scope::MC_COMPACT);
     EncodeForwardingAddresses();
 
@@ -91,6 +92,9 @@ void MarkCompactCollector::CollectGarbage() {
     PcToCodeCache::FlushPcToCodeCache();
 
     RelocateObjects();
+#else
+    UNREACHABLE();
+#endif
   } else {
     SweepSpaces();
     PcToCodeCache::FlushPcToCodeCache();
@@ -107,6 +111,12 @@ void MarkCompactCollector::CollectGarbage() {
 
 
 void MarkCompactCollector::Prepare(GCTracer* tracer) {
+#ifdef BASELINE_GC
+  FLAG_flush_code = false;
+  FLAG_always_compact = false;
+  FLAG_never_compact = true;
+#endif
+
   // Rather than passing the tracer around we stash it in a static member
   // variable.
   tracer_ = tracer;
@@ -1472,7 +1482,7 @@ void MarkCompactCollector::ClearNonLiveTransitions() {
 // words) to indicate free regions in the page found during computation of
 // forwarding addresses and skipped over in subsequent sweeps.
 
-
+#ifndef BASELINE_GC
 // Encode a free region, defined by the given start address and size, in the
 // first word or two of the region.
 void EncodeFreeRegion(Address free_start, int free_size) {
@@ -1689,7 +1699,7 @@ void MarkCompactCollector::EncodeForwardingAddressesInPagedSpace(
         &offset);
   }
 }
-
+#endif
 
 // We scavange new space simultaneously with sweeping. This is done in two
 // passes.
@@ -2062,7 +2072,7 @@ static void SweepSpace(PagedSpace* space) {
   }
 }
 
-
+#ifndef BASELINE_GC
 void MarkCompactCollector::EncodeForwardingAddresses() {
   ASSERT(state_ == ENCODE_FORWARDING_ADDRESSES);
   // Objects in the active semispace of the young generation may be
@@ -2317,7 +2327,7 @@ class MapCompact {
 };
 
 MapCompact::MapUpdatingVisitor MapCompact::map_updating_visitor_;
-
+#endif
 
 void MarkCompactCollector::SweepSpaces() {
   GCTracer::Scope gc_scope(tracer_, GCTracer::Scope::MC_SWEEP);
@@ -2347,6 +2357,7 @@ void MarkCompactCollector::SweepSpaces() {
   int live_maps = static_cast<int>(live_maps_size / Map::kSize);
   ASSERT(live_map_objects_size_ == live_maps_size);
 
+#ifndef BASELINE_GC
   if (Heap::map_space()->NeedsCompaction(live_maps)) {
     MapCompact map_compact(live_maps);
 
@@ -2364,6 +2375,9 @@ void MarkCompactCollector::SweepSpaces() {
 
     map_compact.Finish();
   }
+#else
+  USE(live_maps);
+#endif
 }
 
 
@@ -2416,6 +2430,7 @@ int MarkCompactCollector::IterateLiveObjects(PagedSpace* space,
 }
 
 
+#ifndef BASELINE_GC
 // -------------------------------------------------------------------------
 // Phase 3: Update pointers
 
@@ -2898,6 +2913,7 @@ int MarkCompactCollector::RelocateNewObject(HeapObject* obj) {
 
   return obj_size;
 }
+#endif
 
 
 void MarkCompactCollector::ReportDeleteIfNeeded(HeapObject* obj) {