[PATCH] Add ACLE predefines: maxmin, rounding and h/w integer division

[Assad Hashmi]

Hi,

This patch adds the following predefined macros:
__ARM_FEATURE_DIRECTED_ROUNDING
__ARM_FEATURE_NUMERIC_MAXMIN
__ARM_FEATURE_IDIV

Note that these are related to Graham Hunter¹s patch, (AArch32 v8 NEON
intrinsics for numeric max/min and directed rounding to integral), and were
unit tested together.

-Assad

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