[PATCH] Fix PR16807

[Michael Liao]

Hi

The attached patch fixes PR16807. The root cause is that the constant
powers-of-2 division lowering code directly translates that division
into target-dependant code and breaks on target without legal operations
supported (VPSRAW on <16 x i16> is only supported on AVX2). This patch
fixes that by lowering them into target-independent one and could
generate correct and efficient code on AVX.

Thanks for review
- Michael
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