Suppresses this new warning in clang 10:
IntermNode.h:971:37: warning: class with destructor marked 'final' cannot be inherited from [-Wfinal-dtor-non-final-class]
~TIntermPreprocessorDirective() final;
BUG=angleproject:3903
Change-Id: I26a2fe1440653c83cf1b0498ee3bff0829a10145
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1789930
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
