Revert "[clang] Enable sized deallocation by default in C++14 onwards (#83774)" (#90299)
https://lab.llvm.org/buildbot/#/builders/168/builds/20063 (should be
fixed with #90292)
More details in #83774
This reverts commit cf5a8b489464d09dfdd7a48ce7c8b41d3c9bf819.