Add basic threadAccess analysis #15267

Job	Run time
regression (macos-latest, ocaml-variants.4.14.2+options,ocaml-option-flambda)	13m 24s
regression (ubuntu-latest, ocaml-variants.4.14.2+options,ocaml-option-flambda)	7m 45s
extraction	-1s
	21m 8s

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