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[stdlib] Remove unnecessary methods for comparison with null #794

Job	Run time
Build in gcc-9 (centos:7)	1m 39s
Build in clang-9 (debian:11.1)	57s
Build in gcc-10 (centos:7)	1m 54s
Build in gcc-9 (debian:11.1)	45s
Build in gcc-default (archlinux:base)	1m 10s
Build in clang-11 (debian:11.1)	53s
Build in gcc-10 (debian:11.1)	43s
Build in clang-default (archlinux:base)	1m 0s
Build in clang-default (fedora:34)	1m 57s
Build in gcc-default (fedora:34)	1m 30s
Build in clang-default (fedora:35)	1m 45s
Build in gcc-9 (ubuntu-20.04)	40s
Build in gcc-default (fedora:35)	3m 21s
Build with gcc-10 (macOS-12)	1m 11s
Build in clang-default (amazonlinux:2)	1m 22s
Build in gcc-default (amazonlinux:2)	1m 14s
Build in clang-9 (ubuntu-20.04)	36s
Build with gcc-11 (macOS-12)	1m 2s
Build in gcc-10 (ubuntu-20.04)	41s
Build with default Xcode (macOS-12)	53s
Build in clang-10 (ubuntu-20.04)	27s
Build in gcc-10 (bullseye - aarch64)	5m 35s
Build in gcc-10 (bullseye - s390x)	6m 51s
Build in gcc-11 (ubuntu-20.04)	37s
Build in gcc-10 (bullseye - ppc64le)	6m 29s
Build in clang-11 (ubuntu-20.04)	31s
	45m 43s

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