[clang-format] Correctly annotate pointer/reference in _Generic (#133673)

Fix #133663

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -1417,6 +1417,10 @@ class AnnotatingParser {
         }
       } else if (Contexts.back().ContextType == Context::C11GenericSelection) {
         Tok->setType(TT_GenericSelectionColon);
+        auto *Prev = Tok->getPreviousNonComment();
+        assert(Prev);
+        if (Prev->isPointerOrReference())
+          Prev->setFinalizedType(TT_PointerOrReference);
       } else if (CurrentToken && CurrentToken->is(tok::numeric_constant)) {
         Tok->setType(TT_BitFieldColon);
       } else if (Contexts.size() == 1 &&

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -363,6 +363,10 @@ TEST_F(TokenAnnotatorTest, UnderstandsUsesOfStarAndAmp) {
   ASSERT_EQ(Tokens.size(), 20u) << Tokens;
   EXPECT_TOKEN(Tokens[14], tok::star, TT_PointerOrReference);
 
+  Tokens = annotate("#define foo(x) _Generic(x, bar *: 1, default: 0)");
+  ASSERT_EQ(Tokens.size(), 20u) << Tokens;
+  EXPECT_TOKEN(Tokens[11], tok::star, TT_PointerOrReference);
+
   Tokens = annotate("Thingy kConfig = {\n"
                     "    1,\n"
                     "    (uint16_t)(kScale * height_pixels),\n"