We aren't going to connect the result to anything so we might
as well avoid allocating a register.
Authored by craig.topper on May 6 2021, 4:05 PM.
This revision was landed with ongoing or failed builds.Wed, May 26, 1:10 PM
Closed by commit rGfdf10e6197d0: [RISCV] Use X0 as destination of inserted vsetvli when possible. (authored by craig.topper). · Explain Why
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