better const folding for int and bool #590

Job	Run time
Test (windows-2022)	15m 40s
Android (ubuntu-24.04, aarch64-linux-android)	8m 5s
cargo-deny	1m 1s
Test (ubuntu-24.04)	8m 17s
Compiletest (windows-2022)	15m 31s
Compiletest (macOS-latest)	5m 53s
Test (macOS-latest)	11m 15s
Difftest (macOS-latest)	8m 19s
Compiletest (ubuntu-24.04)	8m 3s
Difftest (windows-2022)	19m 2s
Lint	6m 24s
Difftest (ubuntu-24.04)	10m 29s
test_success	2s
	1h 58m 1s

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