Tim Northover 2a417b96d4 ARM: do not generate BLX instructions on Cortex-M CPUs.
Particularly on MachO, we were generating "blx _dest" instructions on M-class
CPUs, which don't actually exist. They happen to get fixed up by the linker
into valid "bl _dest" instructions (which is why such a massive issue has
remained largely undetected), but we shouldn't rely on that.

llvm-svn: 214959
2014-08-06 11:13:14 +00:00
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