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[TSan][libdispatch] Use FileCheck's --implicit-check-not=...

Description

[TSan][libdispatch] Use FileCheck's --implicit-check-not=...

Use FileCheck's --implicit-check-not='ThreadSanitizer' which increases
the strictness of our tests a bit. NFC.

CHECK: start
CHECK-NOT: ThreadSanitizer
CHECK: done

With --implicit-check-not, the above is turned into:

CHECK-NOT: ThreadSanitizer
CHECK: start
CHECK-NOT: ThreadSanitizer
CHECK: done
CHECK-NOT: ThreadSanitizer

Details

Committed
ylnMay 16 2019, 11:57 AM
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