[clang] [clang-tools-extra] [clang] Don't add documentation comments to the AST if not requested (PR #206363)

[Aaron Ballman via cfe-commits]

================
@@ -1130,6 +1130,11 @@ class Sema final : public SemaBase {
 
   void ActOnComment(SourceRange Comment);
 
+  /// Returns true if a comment at \p Loc should be retained in the AST
+  /// (some consumer such as -Wdocumentation, -fparse-all-comments, code
+  /// completion, or AST-file serialization may read it back).
+  bool shouldRetainCommentsFromLexer(SourceLocation Loc) const;
----------------
AaronBallman wrote:

```suggestion
  bool shouldRetainCommentsInAST(SourceLocation Loc) const;
```
I think this is a bit more clear than `FromLexer`, but I don't insist either.

https://github.com/llvm/llvm-project/pull/206363