[clang-format] handle trailing comments in function definition detection

A follow-up to
f6bc614546
where we handle the case where the semicolon is followed by a trailing
comment.

Reviewed By: MyDeveloperDay

Differential Revision: https://reviews.llvm.org/D107907

clang/lib/Format/TokenAnnotator.cpp

@@ -2482,7 +2482,7 @@ static bool isFunctionDeclarationName(const FormatToken &Current,
   //     return i + 1;
   //   }
   if (Next->Next && Next->Next->is(tok::identifier) &&
-      Line.Last->isNot(tok::semi))
+      !Line.endsWith(tok::semi))
     return true;
   for (const FormatToken *Tok = Next->Next; Tok && Tok != Next->MatchingParen;
        Tok = Tok->Next) {

clang/unittests/Format/FormatTest.cpp

@@ -8252,6 +8252,9 @@ TEST_F(FormatTest, ReturnTypeBreakingStyle) {
   verifyFormat("Tttttttttttttttttttttttt ppppppppppppppp\n"
                "    ABSL_GUARDED_BY(mutex) = {};",
                getGoogleStyleWithColumns(40));
+  verifyFormat("Tttttttttttttttttttttttt ppppppppppppppp\n"
+               "    ABSL_GUARDED_BY(mutex);  // comment",
+               getGoogleStyleWithColumns(40));
 
   Style = getGNUStyle();