better const folding for int and bool #676

Job	Run time
Test (ubuntu-24.04)	7m 58s
Compiletest (macOS-latest)	6m 19s
Compiletest (windows-2022)	16m 11s
Lint	6m 37s
Compiletest (ubuntu-24.04)	8m 33s
Test (macOS-latest)	10m 5s
Difftest (ubuntu-24.04)	10m 15s
Difftest (windows-2022)	17m 0s
Test (windows-2022)	14m 37s
cargo-deny	1m 20s
Difftest (macOS-latest)	8m 15s
Android (ubuntu-24.04, aarch64-linux-android)	7m 58s
test_success	2s
	1h 55m 10s

Provide feedback