Cleanup type conversions in java_bytecode_parsert::read #10873

Job	Run time
check-ubuntu-20_04-make-clang	23m 57s
check-ubuntu-20_04-make-gcc	36m 49s
check-ubuntu-22_04-make-clang	16m 48s
check-macos-13-make-clang	28m 51s
check-macos-14-cmake-clang	1h 14m 4s
check-ubuntu-20_04-cmake-gcc	16m 57s
check-ubuntu-20_04-cmake-gcc-KNOWNBUG	3m 3s
check-ubuntu-20_04-cmake-gcc-THOROUGH	10m 15s
check-ubuntu-20_04-make-clang-smt-z3	3m 49s
check-ubuntu-22_04-cmake-gcc	29m 33s
check-ubuntu-22_04-cmake-gcc-32bit	16m 42s
check-ubuntu-24_04-cmake-gcc-14	14m 7s
check-vs-2019-cmake-build-and-test	33m 37s
check-docker-image	21m 8s
check-string-table	2m 8s
check-vs-2022-make-build-and-test	21m 4s
include-what-you-use	23m 3s
windows-msi-package	6m 3s
	6h 21m 58s

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