[llvm] r178058 - Update PEI's virtual-register-based scavenging to support multiple simultaneous mappings

[Pranav Bhandarkar]

>> Hi Hal,
>>
>> Here is a reduced testcase.
>>
>> llc -O3 -mcpu=hexagonv5r regscavengerbug.ll
> Great, thanks! I'll work on fixing the problem.
>
>   -Hal
I just noticed a typo in a previous email. It should be 
"-mcpu=hexagonv5" and not "hexagonv5r".

Thanks,
Pranav

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