[clang-tidy] NFC refactor lexer-utils to be usable without ASTContext

Summary:
This patch is a small refactoring necessary for
'readability-isolate-declaration' and does not introduce functional changes.
It allows to use the utility functions without a full `ASTContext` and requires only the `SourceManager` and the `LangOpts`.

Reviewers: alexfh, aaron.ballman, hokein

Reviewed By: alexfh

Subscribers: nemanjai, xazax.hun, kbarton, cfe-commits

Tags: #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D52684

llvm-svn: 343850

1 files changed, 3 insertions, 2 deletions

diff --git a/clang-tools-extra/clang-tidy/bugprone/ArgumentCommentCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/ArgumentCommentCheck.cpp
index 068f2c57d03..62f30f79b31 100644
--- a/clang-tools-extra/clang-tidy/bugprone/ArgumentCommentCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/ArgumentCommentCheck.cpp
@@ -91,8 +91,9 @@ static std::vector<std::pair<SourceLocation, StringRef>>
 getCommentsBeforeLoc(ASTContext *Ctx, SourceLocation Loc) {
   std::vector<std::pair<SourceLocation, StringRef>> Comments;
   while (Loc.isValid()) {
-    clang::Token Tok =
-        utils::lexer::getPreviousToken(*Ctx, Loc, /*SkipComments=*/false);
+    clang::Token Tok = utils::lexer::getPreviousToken(
+        Loc, Ctx->getSourceManager(), Ctx->getLangOpts(),
+        /*SkipComments=*/false);
     if (Tok.isNot(tok::comment))
       break;
     Loc = Tok.getLocation();