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/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
index 8b97e27..08a1493 100644
--- a/llvm/lib/IR/AsmWriter.cpp
+++ b/llvm/lib/IR/AsmWriter.cpp
@@ -763,7 +763,7 @@
   /// CreateFunctionSlot - Insert the specified Value* into the slot table.
   void CreateFunctionSlot(const Value *V);
 
-  /// \brief Insert the specified AttributeSet into the slot table.
+  /// Insert the specified AttributeSet into the slot table.
   void CreateAttributeSetSlot(AttributeSet AS);
 
   /// Add all of the module level global variables (and their initializers)
@@ -2236,7 +2236,7 @@
   void printUseLists(const Function *F);
 
 private:
-  /// \brief Print out metadata attachments.
+  /// Print out metadata attachments.
   void printMetadataAttachments(
       const SmallVectorImpl<std::pair<unsigned, MDNode *>> &MDs,
       StringRef Separator);
@@ -3695,7 +3695,7 @@
         /*ShouldPreserveUseListOrder=*/false, /*IsForDebug=*/true);
 }
 
-// \brief Allow printing of Comdats from the debugger.
+// Allow printing of Comdats from the debugger.
 LLVM_DUMP_METHOD
 void Comdat::dump() const { print(dbgs(), /*IsForDebug=*/true); }