make arm-use-movt available for all ARM

[Jeroen Hofstee]

Hello,

As discussed in [1] and [2] the flag, preventing movt /
movw instructions is also useful outside of IOS. This
patch renames the flag in clang and depends on the
same changes in llvm.

I don't have commit privileges, so it would be nice
if someone can pick this up, preferable directly after
the llvm change, with I tend to submit hereafter (and
is actually split in two, so the llvm patch has the same
subject as the clang one (so I can be reverted if there
is a need to it...)

Regards,
Jeroen

[1] 
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130805/183980.html
[2] 
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130812/184064.html


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