Fix broken realloc, rename and mark hlmalloc/hlfree/hlcalloc/hlrealloc unsafe #300

Job	Run time
docs-pr	2s
spell check with typos	7s
build-on-windows (windows-debug)	39s
build-on-linux (linux-kvm-debug)	55s
build-on-windows (windows-release)	57s
build-on-linux (linux-kvm-release)	54s
build-on-linux (linux-hyperv-debug)	1m 0s
fuzzing / fuzz	9m 17s
build-on-linux (linux-hyperv-release)	58s
rust / build (hyperv, amd, debug)	13m 51s
rust / build (hyperv, amd, release)	20m 4s
rust / build (hyperv, intel, debug)	14m 45s
rust / build (hyperv, intel, release)	19m 38s
rust / build (mshv, amd, debug)	9m 29s
rust / build (mshv, amd, release)	13m 12s
rust / build (mshv, intel, debug)	9m 2s
rust / build (mshv, intel, release)	14m 2s
rust / build (kvm, amd, debug)	9m 31s
rust / build (kvm, amd, release)	13m 8s
rust / build (kvm, intel, debug)	9m 29s
rust / build (kvm, intel, release)	13m 38s
	2h 54m 38s

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