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removePred and removeArg do different things. removePred moves the last
predecessor to index k, whereas removeArg slides all the args k or
greater down by 1 index.

Kind of unfortunate different behavior in things named similarly.

Fixes #49122

Change-Id: I9ae409bdac744e713f4c121f948e43db6fdc8542
Trust: Keith Randall <>
Run-TryBot: Keith Randall <>
TryBot-Result: Go Bot <>
Reviewed-by: Cuong Manh Le <>


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