[clang-tidy] Fix crash in readability-container-size-empty (llvm#94527)

Fixed crash caused by call to getCookedLiteral on
template user defined literal. Fix base on assert in getCookedLiteral
method.

Closes llvm#94454

Author: PiotrZSL

clang-tools-extra/clang-tidy/readability/ContainerSizeEmptyCheck.cpp

@@ -96,9 +96,14 @@ AST_MATCHER(QualType, isIntegralType) {
 
 AST_MATCHER_P(UserDefinedLiteral, hasLiteral,
               clang::ast_matchers::internal::Matcher<Expr>, InnerMatcher) {
-  if (const Expr *CookedLiteral = Node.getCookedLiteral()) {
+  const UserDefinedLiteral::LiteralOperatorKind LOK =
+      Node.getLiteralOperatorKind();
+  if (LOK == UserDefinedLiteral::LOK_Template ||
+      LOK == UserDefinedLiteral::LOK_Raw)
+    return false;
+
+  if (const Expr *CookedLiteral = Node.getCookedLiteral())
     return InnerMatcher.matches(*CookedLiteral, Finder, Builder);
-  }
   return false;
 }
 

clang-tools-extra/docs/ReleaseNotes.rst

@@ -376,6 +376,7 @@ Changes in existing checks
 - Improved :doc:`readability-container-size-empty
   <clang-tidy/checks/readability/container-size-empty>` check to prevent false
   positives when utilizing ``size`` or ``length`` methods that accept parameter.
+  Fixed crash when facing template user defined literals.
 
 - Improved :doc:`readability-duplicate-include
   <clang-tidy/checks/readability/duplicate-include>` check by excluding include

clang-tools-extra/test/clang-tidy/checkers/readability/container-size-empty.cpp

@@ -889,3 +889,9 @@ namespace PR88203 {
     // CHECK-FIXES: {{^    }}if (s.empty()) {}{{$}}
   }
 }
+
+namespace PR94454 {
+  template <char...>
+  int operator""_ci() { return 0; }
+  auto eq = 0_ci == 0;
+}