Work around clang-tidy bug in dex_builder.cc.

Bug: 123880763
Test: build with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=*,-readability-*,
    -google-readability-*,-google-runtime-references,-cppcoreguidelines-*,
    -modernize-*,-llvm-*,-bugprone-narrowing-conversions,
    -misc-non-private-member-variables-in-classes,
    -misc-unused-parameters,-hicpp-*,-fuchsia-*

Change-Id: Ibf80f951ae2369a55570770febe8a1c4422181e1