Use size_t for Process offset values #4690

Job	Run time
build-netbsd-latest-gcc	2m 53s
build-dragonflybsd-latest-gcc	2m 13s
build-macos-latest-clang	38s
build-freebsd-latest-clang	2m 3s
build-openbsd-latest-clang	2m 19s
build-solaris-latest-gcc	3m 27s
build-ubuntu-latest-clang-analyzer	4m 11s
build-ubuntu-latest-clang-sanitizer	1m 6s
build-ubuntu-latest-full-featured-clang	1m 10s
build-ubuntu-latest-full-featured-gcc	50s
build-ubuntu-latest-gcc-static	51s
build-ubuntu-latest-minimal-clang	1m 8s
build-ubuntu-latest-minimal-gcc	38s
build-ubuntu-latest-pcp	28s
lint-pcp-config	3s
lint-whitespace	4s
	24m 2s

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