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[ARM] Add ACLE feature macros for MVE.
Needs ReviewPublic

Authored by simon_tatham on Apr 15 2019, 6:01 AM.



If MVE is present at all, then the macro __ARM_FEATURE_MVE is defined
to a value which has bit 0 set for integer MVE, and bit 1 set for
floating-point MVE.

(Floating-point MVE implies integer MVE, so if this macro is defined
at all then it will be set to 1 or 3, never 2.)