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Small optimization to CmmSink.

Andreas Klebinger requested to merge wip/andreask/opt_cmm_sink into master 
Inside `regsUsedIn` we can avoid some thunks by specializing the
recursion. In particular we avoid the thunk for `(f e z)` in the
MachOp/Load branches, where we know this will evaluate to z.

Reduces allocations for T3294 by ~1%.

Prompted by looking at #18814

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