[PATCH] Enable the __ARM_ARCH_EXT_IDIV__ predefine generation on ARM

[Silviu Baranga]

Hi,

The following set of patches enable the generation of the __ARM_ARCH_EXT_IDIV__ predefine
for ARM targets which support division instructions. This will fix PR17555.

clang_ext.diff:
Targets having the hwdiv or hwdiv-arm feature will also the __ARM_ARCH_EXT_IDIV__ predefine.

Also adds the -mhwdiv option to modify these features. The arguments to this option
can be arm/thumb/arm,thumb and indicate in which mode the hardware division instructions
are supported (for example passing -mhwdiv=arm means the target support hardware division
instructions in arm mode but not in thumb mode).

clang_defaults.diff:
Depends on clang_ext.diff.

Sets the default hwdiv/hwdiv-arm features for different targets. The feature is added by
default for all AArch32 v8 targets, Cortex-A7, Cortex-A15, swift, Cortex-A53, Cortex-A57,
Cortex-R5, Cortex-M4 and Cortex-M3.

Please review!

Thanks,
Silviu

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