[ADT] Work around `enumerate` compilation error with modules enabled

[kuhar]

Summary

This manifests on Apple clang 14 with -DLLVM_ENABLE_MODULES=1 and
-DLLVM_ENABLE_ASSERTIONS=1 and seems like a host compiler bug.

Sample compilation failure:
https://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake/52513/consoleFull#-458239162a1ca8a51-895e-46c6-af87-ce24fa4cd561.

[kuhar]

Do not calculate sizes in non-debug builds

[aprantl]

Thanks, but this does not seem to have worked: https://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake/52610/consoleText

[aprantl]

Oh wait, I didn't realize you haven't landed it yet :-)

[aprantl]

Thanks! It works.

llvm/include/llvm/ADT/STLExtras.h

 /// Output:
 ///   Item 0: 20
 ///   Item 1: 21
 ///   Item 2: 22
 ///   Item 3: 23
 ///
 template <typename FirstRange, typename... RestRanges>
 auto enumerate(FirstRange &&First, RestRanges &&...Rest) {
-  assert((sizeof...(Rest) == 0 ||
-          all_equal({std::distance(adl_begin(First), adl_end(First)),
-                     std::distance(adl_begin(Rest), adl_end(Rest))...})) &&
-         "Ranges have different length");
+  if constexpr (sizeof...(Rest) != 0) {
+#ifndef NDEBUG
+    // Note: Create an array instead of an initializer list to work around an
+    // Apple clang 14 compiler bug.
+    size_t sizes[] = {
+        static_cast<size_t>(std::distance(adl_begin(First), adl_end(First))),
+        static_cast<size_t>(std::distance(adl_begin(Rest), adl_end(Rest)))...};
+    assert(all_equal(sizes) && "Ranges have different length");
+#endif
+  }
   using enumerator = detail::zippy<detail::zip_enumerator, detail::index_stream,
                                    FirstRange, RestRanges...>;
   return enumerator(detail::index_stream{}, std::forward<FirstRange>(First),
                     std::forward<RestRanges>(Rest)...);
 }
 
 namespace detail {