Revert of [heap] Parallel newspace evacuation, semispace copy, and compaction \o/

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index ecea13d522d400beb86d69068aa4aa25403e3060..4f8ba95fbd81eec5b35c0d734ae38fceb4b023f0 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -2922,7 +2922,9 @@
  public:
   explicit CompactionSpaceCollection(Heap* heap)
       : old_space_(heap, OLD_SPACE, Executability::NOT_EXECUTABLE),
-        code_space_(heap, CODE_SPACE, Executability::EXECUTABLE) {}
+        code_space_(heap, CODE_SPACE, Executability::EXECUTABLE),
+        duration_(0.0),
+        bytes_compacted_(0) {}
 
   CompactionSpace* Get(AllocationSpace space) {
     switch (space) {
@@ -2937,9 +2939,21 @@
     return nullptr;
   }
 
+  void ReportCompactionProgress(double duration, intptr_t bytes_compacted) {
+    duration_ += duration;
+    bytes_compacted_ += bytes_compacted;
+  }
+
+  double duration() const { return duration_; }
+  intptr_t bytes_compacted() const { return bytes_compacted_; }
+
  private:
   CompactionSpace old_space_;
   CompactionSpace code_space_;
+
+  // Book keeping.
+  double duration_;
+  intptr_t bytes_compacted_;
 };