[build] Use shared libraries by default for debug builds

src/handles.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HANDLES_H_
 #define V8_HANDLES_H_
 
 #include "include/v8.h"
 #include "src/base/functional.h"
 #include "src/base/macros.h"
@@ skipping 45 matching lines @@
 
   // Returns the address to where the raw pointer is stored.
   V8_INLINE Object** location() const {
     SLOW_DCHECK(location_ == nullptr ||
                 IsDereferenceAllowed(INCLUDE_DEFERRED_CHECK));
     return location_;
   }
 
   enum DereferenceCheckMode { INCLUDE_DEFERRED_CHECK, NO_DEFERRED_CHECK };
 #ifdef DEBUG
-  bool IsDereferenceAllowed(DereferenceCheckMode mode) const;
+  bool V8_EXPORT_PRIVATE IsDereferenceAllowed(DereferenceCheckMode mode) const;
 #else
   V8_INLINE
-  bool IsDereferenceAllowed(DereferenceCheckMode mode) const { return true; }
+  bool V8_EXPORT_PRIVATE IsDereferenceAllowed(DereferenceCheckMode mode) const {
+    return true;
+  }
 #endif  // DEBUG
 
   Object** location_;
 };
 
 
 // ----------------------------------------------------------------------------
 // A Handle provides a reference to an object that survives relocation by
 // the garbage collector.
 //
@@ skipping 331 matching lines @@
     next = limit = NULL;
     sealed_level = level = 0;
     canonical_scope = NULL;
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HANDLES_H_