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 08ccf9105c8f97eb58849213083e88b25c01bc63..a2f0837515c5bf09f5245cca7eca7b80a72edf1e 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1494,8 +1494,8 @@ class PromiseOnStack {
 // 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_; }
@@ -1505,8 +1505,6 @@ class SaveContext BASE_EMBEDDED {
     return (c_entry_fp_ == 0) || (c_entry_fp_ > frame->sp());
   }
 
-  Isolate* isolate() { return isolate_; }
-
  private:
   Isolate* const isolate_;
   Handle<Context> context_;