buffer: fix end parameter bugs in indexOf/lastIndexOf #5758

Job	Run time
Build slim tarball	2m 5s
x86_64-linux: with shared libraries	22m 30s
x86_64-darwin: with shared libraries	30m 46s
aarch64-linux: with shared libraries	18m 20s
aarch64-darwin: with shared libraries	18m 19s
	1h 32m 0s

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