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[AArch64] Assembler support for the ARMv8.2a dot product instructions

Description

[AArch64] Assembler support for the ARMv8.2a dot product instructions

Dot product is an optional ARMv8.2a extension, see also the public architecture
specification here:
https://developer.arm.com/products/architecture/a-profile/exploration-tools.
This patch adds AArch64 assembler support for these dot product instructions.

Differential Revision: https://reviews.llvm.org/D36515