[LLVMdev] Fixing segmented stacks

[Sanjoy Das]

Hi!

The first patch fixes the problem of a MOV after a RET by emitting a
fake instruction (as suggested by Duncan), which is lowered in
MCInstLower.

The second patch fixes a bug reported by -verify-machineinstrs.

Thanks!
-- 
Sanjoy Das
http://playingwithpointers.com
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