[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.

This change is the same as that posted on 5th Sep and reviewed on 8th Sep,
but excludes Graham Hunter¹s changes (committed as r217242).


-Assad
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