Hexagon HVX (target/hexagon) instruction utility functions

Functions to support scatter/gather
Add new file to target/hexagon/meson.build

Reviewed-by: Richard Henderson <richard.henderson@linaro.or

Hexagon HVX (target/hexagon) instruction utility functions

Functions to support scatter/gather
Add new file to target/hexagon/meson.build

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>

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