[clang-format] Fix a regression in annotating ObjCBlockLParen (llvm#107021)

Fixes llvm#106994.

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -3588,8 +3588,7 @@ static FormatToken *getFunctionName(const AnnotatedLine &Line,
 
     // Make sure the name is followed by a pair of parentheses.
     if (Name) {
-      if (Tok->is(tok::l_paren) && Tok->isNot(TT_FunctionTypeLParen) &&
-          Tok->MatchingParen) {
+      if (Tok->is(tok::l_paren) && Tok->is(TT_Unknown) && Tok->MatchingParen) {
         OpeningParen = Tok;
         return Name;
       }

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -1678,6 +1678,13 @@ TEST_F(TokenAnnotatorTest, UnderstandsObjCBlock) {
                     "}();");
   ASSERT_EQ(Tokens.size(), 19u) << Tokens;
   EXPECT_TOKEN(Tokens[9], tok::l_brace, TT_ObjCBlockLBrace);
+
+  Tokens = annotate("id (^block)(Foo *a) = ^id _Nullable(Foo *_Nullable a) {\n"
+                    "  return a;\n"
+                    "};");
+  ASSERT_EQ(Tokens.size(), 27u) << Tokens;
+  EXPECT_TOKEN(Tokens[0], tok::identifier, TT_Unknown); // Not CtorDtorDeclName.
+  EXPECT_TOKEN(Tokens[1], tok::l_paren, TT_ObjCBlockLParen);
 }
 
 TEST_F(TokenAnnotatorTest, UnderstandsObjCMethodExpr) {