[Isolates] Convert more static data either to read-only or to per-isolate.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index a679339bc088261eb8850cbfa0c33dd800faeac4..551ea3cbd37d4d7a06f52f3c0eafbd9c62f301f4 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -88,12 +88,12 @@ void MarkCompactCollector::CollectGarbage() {
     heap_->MarkMapPointersAsEncoded(true);
     UpdatePointers();
     heap_->MarkMapPointersAsEncoded(false);
-    PcToCodeCache::FlushPcToCodeCache();
+    heap_->isolate()->pc_to_code_cache()->Flush();
 
     RelocateObjects();
   } else {
     SweepSpaces();
-    PcToCodeCache::FlushPcToCodeCache();
+    heap_->isolate()->pc_to_code_cache()->Flush();
   }
 
   Finish();