perf: optimize constant-base exp #1816

Job	Run time
docs	1m 56s
feature-checks	3m 19s
fmt	12s
state-tests (ubuntu, aot)	4m 1s
state-tests (macos, jit)	7m 40s
state-tests (ubuntu, interpreter)	3m 2s
clippy	2m 16s
state-tests (ubuntu, jit)	4m 48s
state-tests (macos, interpreter)	4m 40s
test ubuntu-x64-nightly dev	3m 6s
test macos-arm64-nightly release	7m 43s
test ubuntu-x64-stable release	5m 35s
test macos-arm64-stable dev	4m 17s
test macos-arm64-stable release	5m 41s
test ubuntu-x64-stable dev	2m 55s
test ubuntu-x64-nightly release	5m 12s
test macos-arm64-nightly dev	2m 50s
deploy-docs	0s
success	3s
	1h 9m 16s

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