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perf(@angular/build): avoid full JSON parsing when updating sourcemap… #3492

Job	Run time
build-e2e-windows	34s
build	35s
lint	2m 7s
e2e-windows	0s
Browser Compatibility Tests	0s
publish-snapshots	0s
test	0s
e2e-package-managers	0s
e2e	0s
e2e-snapshots	0s
	3m 16s