[clang-format] Don't break before *const (#128817)

Fixes #28919

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -6196,7 +6196,8 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
     return Line.IsMultiVariableDeclStmt ||
            (getTokenPointerOrReferenceAlignment(Right) ==
                 FormatStyle::PAS_Right &&
-            (!Right.Next || Right.Next->isNot(TT_FunctionDeclarationName)));
+            !(Right.Next &&
+              Right.Next->isOneOf(TT_FunctionDeclarationName, tok::kw_const)));
   }
   if (Right.isOneOf(TT_StartOfName, TT_FunctionDeclarationName,
                     TT_ClassHeadName, tok::kw_operator)) {

clang/unittests/Format/FormatTest.cpp

@@ -4642,6 +4642,9 @@ TEST_F(FormatTest, FormatsExternC) {
                "  int i = 42;\n"
                "  return i;\n"
                "}");
+  verifyFormat(
+      "extern \"C\" char const *const\n"
+      "    OpenCL_source_OpenCLRunTime_test_attribute_opencl_unroll_hint;");
 
   FormatStyle Style = getLLVMStyle();
   Style.BreakBeforeBraces = FormatStyle::BS_Custom;