Revert of [api] Clean up scopes and precheck instantiations cache

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 10954a94eb8e616e9787b3b209e086060de71144..32845124822c61d60be45e9bc4c4acaadc8ae7bb 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1468,8 +1468,8 @@
 // versions of GCC. See V8 issue 122 for details.
 class SaveContext BASE_EMBEDDED {
  public:
-  explicit inline SaveContext(Isolate* isolate);
-  inline ~SaveContext();
+  explicit SaveContext(Isolate* isolate);
+  ~SaveContext();
 
   Handle<Context> context() { return context_; }
   SaveContext* prev() { return prev_; }
@@ -1478,8 +1478,6 @@
   bool IsBelowFrame(StandardFrame* frame) {
     return (c_entry_fp_ == 0) || (c_entry_fp_ > frame->sp());
   }
-
-  Isolate* isolate() { return isolate_; }
 
  private:
   Isolate* isolate_;