[6.0][CAS] Fix task continuation misuse when CAS error happens #1593
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Explanation: Fix a crash due to misuse continuation when error happens
Scope: This fixes a bug that can cause crashes when error happens when enable remote caching for swift compilation
Original PR: #1591
Issue: rdar://127452621
Risk: Low. Only affects compilation caching and when some kind of error happens from CAS
Reviewer: @benlangmuir