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/lib/CodeGen/AsmPrinter/WinCFGuard.h b/llvm/lib/CodeGen/AsmPrinter/WinCFGuard.h
index 553b4ae..124e8f0 100644
--- a/llvm/lib/CodeGen/AsmPrinter/WinCFGuard.h
+++ b/llvm/lib/CodeGen/AsmPrinter/WinCFGuard.h
@@ -29,23 +29,23 @@
 
   void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {}
 
-  /// \brief Emit the Control Flow Guard function ID table
+  /// Emit the Control Flow Guard function ID table
   void endModule() override;
 
-  /// \brief Gather pre-function debug information.
+  /// Gather pre-function debug information.
   /// Every beginFunction(MF) call should be followed by an endFunction(MF)
   /// call.
   void beginFunction(const MachineFunction *MF) override {}
 
-  /// \brief Gather post-function debug information.
+  /// Gather post-function debug information.
   /// Please note that some AsmPrinter implementations may not call
   /// beginFunction at all.
   void endFunction(const MachineFunction *MF) override {}
 
-  /// \brief Process beginning of an instruction.
+  /// Process beginning of an instruction.
   void beginInstruction(const MachineInstr *MI) override {}
 
-  /// \brief Process end of an instruction.
+  /// Process end of an instruction.
   void endInstruction() override {}
 };