Akira Hatanaka be9668675a [ARM, stack protector] If supported, use armv7 instructions.
This commit enables using movt/movw to load the stack guard address:

movw r0, :lower16:(L_g3$non_lazy_ptr-(LPC0_0+8))
movt r0, :upper16:(L_g3$non_lazy_ptr-(LPC0_0+8))
ldr r0, [pc, r0]

Previously a pc-relative load was emitted:

ldr r0, LCPI0_0
ldr r0, [pc, r0]

rdar://problem/18740489


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220470 91177308-0d34-0410-b5e6-96231b3b80d8
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