Revert: [llvm-mca] Flush the output stream before we start the analysis of a…

Description

Revert: [llvm-mca] Flush the output stream before we start the analysis of a new code region. NFC

Not sure why, but it breaks buildbot clang-cmake-armv8-full.
It causes a failure in TEST 'Xray-armhf-linux :: TestCases/Posix/profiling-single-threaded.cc'.

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Committed
adibiagioWed, Jun 13, 9:33 AM
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rL334616: [CostModel][X86] Test showing failure to recognise BROADCAST shuffle mask if…
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