thunderFX : pass to remove empty autocast regions #4925

Job	Run time
pytester (ubuntu-22.04, 3.10, latest, core)	10m 1s
pytester (ubuntu-22.04, 3.10, latest, ops)	26m 27s
pytester (ubuntu-22.04, 3.10, nightly, core)	10m 9s
pytester (ubuntu-22.04, 3.10, nightly, ops)	27m 12s
pytester (macOS-14, 3.10, latest, core)	7m 4s
pytester (macOS-14, 3.10, latest, ops)	23m 0s
pytester (macOS-14, 3.10, nightly, core)	6m 22s
pytester (macOS-14, 3.10, nightly, ops)	19m 16s
pytester (windows-2022, 3.10, latest, core)	25m 20s
pytester (windows-2022, 3.10, nightly, core)	26m 24s
pytester (ubuntu-22.04, 3.11, latest)	23m 29s
pytester (ubuntu-22.04, 3.12, latest)	27m 33s
testing-guardian	1s
	3h 52m 18s

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