[PATCH] Switch __ARM_ARCH_7S__ to __ARM_ARCH_EXT_IDIV__ for use of sdiv/udiv assembly.

[Stephen Hines]

This patch fixes some ifdef's in compiler-rt that only triggered for
Apple's 7S processor. Cortex-a15 devices like exynos5 and krait also
support hardware division, so this change enables that in compiler-rt.
There are no remaining ifdef's specific to __ARM_ARCH_7S__ in compiler-rt.

This change was enabled by the following other CLs in Clang and
LLVM: r192963, r193074, and r193075.

Thanks,
Steve
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