Clamp graph meter values in "double" type #1514

Job	Run time
build-openbsd-latest-clang	3m 5s
build-freebsd-latest-clang	3m 24s
build-dragonflybsd-latest-gcc	2m 47s
build-macos-latest-clang	37s
build-solaris-latest-gcc	6m 51s
build-ubuntu-latest-clang-analyzer	1m 11s
build-ubuntu-latest-clang-sanitizer	1m 5s
build-ubuntu-latest-full-featured-clang	1m 4s
build-ubuntu-latest-full-featured-gcc	49s
build-ubuntu-latest-gcc-static	55s
build-ubuntu-latest-minimal-clang	1m 2s
build-ubuntu-latest-minimal-gcc	40s
build-ubuntu-latest-pcp	28s
lint-pcp-config	3s
lint-whitespace	3s
	24m 4s

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