Wu, Yingcong 67f5b05cdc Add test for Flags.data_flow_trace
`CollectDataFlow()` uses `Flags.collect_data_flow` and
`Flags.data_flow_trace` at the same time. But in the null check before
the invocation, only `Flags.collect_data_flow` is checked, and there is
no other method to make sure `Flags.data_flow_trace` is not null, so
adding a null check for `Flags.data_flow_trace`.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D145040
2023-03-07 22:18:29 -08:00
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