[RESEND,PATCH] ARM: fix __div64_32() error when compiling with clang

[David Laight]

> And actually, the same applies on BE, but the other way around. So we
> should mark __xl as an output register as well, as __xl will assume
> the right value depending on the endianness.

Why not use "+r" to indicate than an 'output' parameter is also
used as an input.

Rather cleaner than specifying the same C variable as both
input and output.

	David

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