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Since D110065, the 'R' profile support is added to LLVM. It turns the `generic` cpu into the intersection of v8-a and v8-r. However, this makes some backward compatibility problems. The original patch makes the clang driver implicitly pass -march=armv8-a when only the triple is specified. Since it only applies to clang, other tools like llvm-objdump still faces the backward compatibility problem. This patch applies the same idea to MC related tools by enabling '+v8a' feature when nothing is specified (both CPU and FS are empty) for MCSubtargetInfo creation. This patch should fix PR53956. Reviewed by: labrinea Differential Revision: https://reviews.llvm.org/D124319 (cherry picked from commit 4a31af88)
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