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

Differential Revision: https://reviews.llvm.org/D44636 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327965 91177308-0d34-0410-b5e6-96231b3b80d8
earl · Mar 20, 2018 · 112a581 · 112a581
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diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
@@ -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