Remove \brief commands from doxygen comments.

We've been running doxygen with the autobrief option for a couple of
years now. This makes the \brief markers into our comments
redundant. Since they are a visual distraction and we don't want to
encourage more \brief markers in new code either, this patch removes
them all.

Patch produced by

  for i in $(git grep -l '\\brief'); do perl -pi -e 's/\\brief //g' $i & done

Differential Revision: https://reviews.llvm.org/D46290

llvm-svn: 331272
diff --git a/llvm/tools/llvm-mca/Dispatch.h b/llvm/tools/llvm-mca/Dispatch.h
index c08515d..146cfc0 100644
--- a/llvm/tools/llvm-mca/Dispatch.h
+++ b/llvm/tools/llvm-mca/Dispatch.h
@@ -28,7 +28,7 @@
 class Scheduler;
 class Backend;
 
-/// \brief Manages hardware register files, and tracks data dependencies
+/// Manages hardware register files, and tracks data dependencies
 /// between registers.
 class RegisterFile {
   const llvm::MCRegisterInfo &MRI;
@@ -155,7 +155,7 @@
 #endif
 };
 
-/// \brief tracks which instructions are in-flight (i.e. dispatched but not
+/// tracks which instructions are in-flight (i.e. dispatched but not
 /// retired) in the OoO backend.
 ///
 /// This class checks on every cycle if/which instructions can be retired.
@@ -217,7 +217,7 @@
 #endif
 };
 
-// \brief Implements the hardware dispatch logic.
+// Implements the hardware dispatch logic.
 //
 // This class is responsible for the dispatch stage, in which instructions are
 // dispatched in groups to the Scheduler.  An instruction can be dispatched if