Revert part of r16-869-ge3d3d6d7d2c8ab

The following reverts part of the changes done by r16-869-ge3d3d6d7d2c8ab
which AFAICS was never posted on the mailing list.  The hunk reverted
adds extra costs for vector construction of AVX or AVX512 vectors
because Honza thought we're only adding 1 conversion for all constructs,
but in fact we're costing each individual unique scalar source used.

Noticed when investigating PR120234, but this does not affect it
since there it's all SSE sized operations.

Still this is a regression, though reading r16-869-ge3d3d6d7d2c8ab
commit message indicating "correct numbers regress benchmarks" might
make this somewhat dangerous.  Still r16-531-g37e61c793c1b22 already
made the constructor costs much more expensive for integers, so
this might compensate.

	* config/i386/i386.cc (ix86_vector_costs::add_stmt_cost):
	Remove double and triple accounting of GPR -> XMM moves
	in construction of AVX and AVX512 vectors.

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