Add java.lang.String::startsWith #449

Job	Run time
rust_ci (macos-latest, stable)	1m 37s
rust_ci (macos-latest, beta)	2m 38s
rust_ci (macos-latest, nightly)	1m 36s
rust_ci (ubuntu-latest, stable)	1m 26s
rust_ci (ubuntu-latest, beta)	1m 37s
rust_ci (ubuntu-latest, nightly)	1m 38s
rust_ci (windows-latest, stable)	3m 0s
rust_ci (windows-latest, beta)	2m 56s
rust_ci (windows-latest, nightly)	2m 50s
	19m 18s

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