[clang-tidy] Make deleted constructor public

Making them private was a way to hide the constructor, we can
explicitly delete them, which give a better compilation error message as
well.

Also see: https://stackoverflow.com/q/55205874

Bug: v8:10488
Change-Id: I1c037a501c1da39f027c071e5e64d36fd1c95c6d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2219419Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68049}

src/handles/handles.h

@@ -204,6 +204,10 @@ class HandleScope {
     return ::operator new(size, storage);
   }
 
+  // Prevent heap allocation or illegal handle scopes.
+  void* operator new(size_t size) = delete;
+  void operator delete(void* size_t) = delete;
+
   inline ~HandleScope();
 
   inline HandleScope& operator=(HandleScope&& other) V8_NOEXCEPT;
@@ -239,10 +243,6 @@ class HandleScope {
   static const int kCheckHandleThreshold = 30 * 1024;
 
  private:
-  // Prevent heap allocation or illegal handle scopes.
-  void* operator new(size_t size) = delete;
-  void operator delete(void* size_t) = delete;
-
   Isolate* isolate_;
   Address* prev_next_;
   Address* prev_limit_;