Matt Arsenault fcf8b40603 MIR: Infer not-SSA for subregister defs
It's possible to have a single virtual register def with a subreg
index that would pass the previous check, but it's not possible to
have a subregister def in SSA.

This is in preparation for adding stricter checks for SSA MIR.
2020-08-27 16:56:16 -04:00
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