[PATCH] Introduce prefetch builtin intrinsics for ARM and AArch64

[Yi Kong]

Hi Tim, Saleem,

ARM supports instruction prefetch which the generic prefetch intrinsic
is not able to describe. AArch64 has even more granular instructions.

This patchset adds __builtin_arm_prefetch intrinsic to ARM and
AArch64. Note that they have different syntax, thus cannot be shared
across platforms. Corresponding platform-independent ACLE intrinsics
will be added in a separate patch.

Cheers

Yi
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