fix(@angular/build): do not mark Babel _defineProperty helper functio… #212

Job	Run time
list	42s
workflow (build-cli)	2m 15s
workflow (modules-builder-tests)	2m 33s
workflow (devkit-core-tests)	2m 0s
workflow (devkit-core-tests-rerun)	2m 7s
workflow (build-unit-tests)	2m 28s
	12m 5s

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