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[Release Notes] Add release note for llvm-mca. 

Differential Revision: https://reviews.llvm.org/D44636

llvm-svn: 327965
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Andrea Di Biagio 2018-03-20 10:25:36 +00:00
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llvm/docs/ReleaseNotes.rst
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@ -45,6 +45,11 @@ Non-comprehensive list of changes in this release
* Symbols starting with ``?`` are no longer mangled by LLVM when using the
Windows ``x`` or ``w`` IR mangling schemes.
* A new tool named :doc:`llvm-mca <CommandGuide/llvm-mca>` has been added.
:program:`llvm-mca` is a static performance analysis tool that uses
information available in LLVM to statically predict the performance of
machine code for a specific CPU.
* Note..
.. NOTE