Merging r373655:

------------------------------------------------------------------------
r373655 | nickdesaulniers | 2019-10-03 13:10:02 -0700 (Thu, 03 Oct 2019) | 16 lines

[AArch64InstPrinter] prefer bfi to bfc for < armv8.2-a

Summary:
Fixes pr/42576.

Link: https://github.com/ClangBuiltLinux/linux/issues/697

Reviewers: t.p.northover

Reviewed By: t.p.northover

Subscribers: kristof.beyls, hiraditya, llvm-commits, srhines

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68356
------------------------------------------------------------------------