Implement SpinLockHolder in terms of std::lock_guard.

PiperOrigin-RevId: 841813256
Change-Id: Id8a446f889d999720c9d9db527a9f6dfb8b2d6a9

Author: ckennelly

absl/base/internal/spinlock.h

@@ -31,6 +31,7 @@
 
 #include <atomic>
 #include <cstdint>
+#include <mutex>
 #include <type_traits>
 
 #include "absl/base/attributes.h"
@@ -247,25 +248,18 @@ class ABSL_LOCKABLE ABSL_ATTRIBUTE_WARN_UNUSED SpinLock {
 
 // Corresponding locker object that arranges to acquire a spinlock for
 // the duration of a C++ scope.
-class ABSL_SCOPED_LOCKABLE [[nodiscard]] SpinLockHolder {
+class ABSL_SCOPED_LOCKABLE [[nodiscard]] SpinLockHolder
+    : public std::lock_guard<SpinLock> {
  public:
   inline explicit SpinLockHolder(
       SpinLock& l ABSL_INTERNAL_ATTRIBUTE_CAPTURED_BY(this))
       ABSL_EXCLUSIVE_LOCK_FUNCTION(l)
-      : lock_(l) {
-    l.lock();
-  }
+      : std::lock_guard<SpinLock>(l) {}
   ABSL_DEPRECATE_AND_INLINE()
   inline explicit SpinLockHolder(SpinLock* l) ABSL_EXCLUSIVE_LOCK_FUNCTION(l)
       : SpinLockHolder(*l) {}
 
-  inline ~SpinLockHolder() ABSL_UNLOCK_FUNCTION() { lock_.unlock(); }
-
-  SpinLockHolder(const SpinLockHolder&) = delete;
-  SpinLockHolder& operator=(const SpinLockHolder&) = delete;
-
- private:
-  SpinLock& lock_;
+  inline ~SpinLockHolder() ABSL_UNLOCK_FUNCTION() = default;
 };
 
 // Register a hook for profiling support.