Lei Huang 686cee0945 [NFC][ASAN] Add brackets around not command
Under certain execution conditions, the `not` command binds to the command the
output is piped to rather than the command piping the output. In this case, that
flips the return code of the FileCheck invocation, causing a failure when
FileCheck succeeds.

llvm-svn: 366805
2019-07-23 13:10:29 +00:00
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