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flang-aarch64-ubuntu-clang: Refine the set-up for `-WError`

Authored by awarzynski on Oct 5 2020, 12:59 AM.

Description

flang-aarch64-ubuntu-clang: Refine the set-up for -WError

As this builder is primiarly used for testing Flang, use -WError only
when building Flang (as opposed to all of LLVM).

Differential Revision: https://reviews.llvm.org/D88811