[i386] tidy interleave pattern names

[Richard Henderson]

The canonical optab name for the x86 "unpck" style instructions is 
"vec_interleave_{high,low}".  We had a brace of unnecessary expanders 
that effectively renamed one from the other.  This patch deletes the
redundant expanders and renames the original instructions.

Tested on x86-64.


r~
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