[clang] [clang-tools-extra] [clang][modules] Shrink the size of `Module::Headers` (PR #113395)

[Jan Svoboda via cfe-commits]

================
@@ -271,8 +271,22 @@ class alignas(8) Module {
     DirectoryEntryRef Entry;
   };
 
-  /// The headers that are part of this module.
-  SmallVector<Header, 2> Headers[5];
+private:
+  unsigned HeaderKindBeginIndex[6] = {};
----------------
jansvoboda11 wrote:

I used `NumHeaderKinds`, but explained the `+1` in a comment.

https://github.com/llvm/llvm-project/pull/113395
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