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[ARM] Add subtarget features for ARMv8.2-A
This adds subtarget features for ARMv8.2-A, which builds on (and requires the features from) ARMv8.1-A. Most assembler-visible features of ARMv8.2-A are system instructions, and are all required parts of the architecture, so just depend on the HasV8_2aOps subtarget feature. There is also one large, optional feature, which adds 16-bit floating point versions of all existing floating-point instructions (VFP and SIMD), this is represented by the FeatureFullFP16 subtarget feature. Differential Revision: http://reviews.llvm.org/D15036 llvm-svn: 254399
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