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[ARM][AAarch64] Initial command-line support for v8.7-A

Authored by pratlucas on Nov 16 2020, 6:48 AM.

Description

[ARM][AAarch64] Initial command-line support for v8.7-A

This introduces command-line support for the 'armv8.7-a' architecture name
(and an alias without the '-', as usual), and for the 'ls64' extension name.

Based on patches written by Simon Tatham.

Reviewed By: ostannard

Differential Revision: https://reviews.llvm.org/D91776

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