RE: x86/csum: Remove unnecessary odd handling

[David Laight]

From: Noah Goldstein
> Sent: 01 September 2023 23:21
...
> +	return add32_with_carry(temp64 >> 32, temp64 & 0xffffffff);

The generic C alternative:
	return (temp64 + ror64(temp64, 32)) >> 32;
is the same number of instructions but might get
better scheduling.

The C version of csum_fold() from arc/include/asm/checksum.h
is also better than the x86 asm version.
(And also pretty much all the other architecture dependant
copies.)

	David

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