Fix #954. safe_memcmp in tinystring. #2257

Job	Run time
macOS (macos-x86_64-dyn)	2m 44s
Windows (windows-2022)	9m 13s
macOS (ios-arm64-dyn)	2m 29s
OSSF Scorecard	25s
macOS (ios-x86_64-dyn)	2m 31s
Linux (linux-x86_64-static, true)	5m 21s
Linux (android-arm, true)	3m 29s
Linux (linux-x86_64-static, false)	3m 51s
Linux (linux-aarch64-musl-dyn, true)	2m 58s
macOS (macos-aarch64-dyn)	2m 8s
Linux (android-arm64, false)	4m 29s
Linux (linux-aarch64-dyn, false)	2m 1s
Linux (linux-x86_64-dyn, false)	3m 49s
Linux (linux-x86_64-dyn, true)	5m 3s
Linux (wasm, true)	2m 15s
Linux (linux-aarch64-musl-dyn, false)	2m 3s
Linux (android-arm, false)	4m 26s
Linux (wasm, false)	2m 20s
Linux (linux-aarch64-dyn, true)	2m 1s
Linux (android-arm64, true)	3m 38s
	1h 7m 14s

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