divide 64-bit by constant for 32-bit target machines

[Dinar Temirbulatov <dtemirbulatov at gmail dot com>]

Hi,
Here is the patch that adds support for divide 64-bit by constant for
32-bit target machines, this patch was tested on arm-7a with no new
regressions, also I am not sure on how to avoid for example i686
targets since div operation there is fast compared to over targets and
it showed better performance with  libc/sysdeps/wordsize-32/divdi3.c
__udivdi3 vs my implementation on the compiler side, it is not clear
for me by looking at the udiv_cost[speed][SImode] value.
                                                              thanks, Dinar.

Attachment: 11.patch
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