[PATCH] [hexagon] remove sxth after max with two halfword operands

[Ikhlas Ajbar]

Hello,

The attached patch improves the way min and max instructions are 
generated to recognize more patterns. In particular, this patch was 
needed to remove a sign extend halfword "sxth" after a max with two 
halfword operands: testcases attached.

Tested on x86-linux with make check. Could you please review the patch?

Thanks,
Ikhlas
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