Minor optimizations for `Range.shift/2` #12881

Job	Run time
Windows Server 2019, Erlang/OTP 27.3	7m 3s
Check POSIX-compliant	11s
Check Licence Compliance	8m 54s
Ubuntu 24.04, Erlang/OTP 26.0	5m 0s
Windows Server 2019, Erlang/OTP 26.2	6m 14s
Ubuntu 24.04, Erlang/OTP 27.0	5m 2s
Ubuntu 24.04, Erlang/OTP master	4m 54s
Ubuntu 24.04, Erlang/OTP 28.0 (deterministic)	5m 55s
Windows Server 2019, Erlang/OTP 28.0	6m 47s
Ubuntu 24.04, Erlang/OTP 28.0 (coverage)	7m 5s
Ubuntu 24.04, Erlang/OTP 28.0	5m 31s
Ubuntu 24.04, Erlang/OTP maint	4m 53s
Ubuntu 24.04, Erlang/OTP 27.3	4m 54s
	1h 12m 23s

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