[NFC][AMDGPULowerModuleLDSPass] Fix buildbot santizier failed to compile

It seems that the sanitizer-x86_64-linux-android wasn't able to deduce
the template argument:

  AMDGPULowerModuleLDSPass.cpp:1192:53: error: no viable constructor or
  deduction guide for deduction of template arguments of 'vector'
        auto TableLookupVariablesOrdered = sortByName(std::vector(

This patch makes the template argument explicit.