[clang][NFC] Convert `Parser::ScopeCacheSize` to a constant
diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
index 645df4a..d9cf381 100644
--- a/clang/include/clang/Parse/Parser.h
+++ b/clang/include/clang/Parse/Parser.h
@@ -94,7 +94,7 @@
   StackExhaustionHandler StackHandler;
 
   /// ScopeCache - Cache scopes to reduce malloc traffic.
-  enum { ScopeCacheSize = 16 };
+  static constexpr int ScopeCacheSize = 16;
   unsigned NumCachedScopes;
   Scope *ScopeCache[ScopeCacheSize];