load_unaligned_zeropad() on x86-64

[David Laight]

The change e419b4cc585680940bc42f8ca8a071d6023fb1bb added
asm code for load_unaligned_zeropad().

However it doesn't look right for 64bit.
It masks the address with ~3 not ~7 so the second
access could still cross a page boundary and fault.

	David

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