Remove \brief commands from doxygen comments.

This is similar to the LLVM change https://reviews.llvm.org/D46290.

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

Differential Revision: https://reviews.llvm.org/D46320

llvm-svn: 331834
diff --git a/clang/lib/CodeGen/CGExprAgg.cpp b/clang/lib/CodeGen/CGExprAgg.cpp
index 7e02a65..713224c 100644
--- a/clang/lib/CodeGen/CGExprAgg.cpp
+++ b/clang/lib/CodeGen/CGExprAgg.cpp
@@ -220,7 +220,7 @@
   EmitFinalDestCopy(E->getType(), LV);
 }
 
-/// \brief True if the given aggregate type requires special GC API calls.
+/// True if the given aggregate type requires special GC API calls.
 bool AggExprEmitter::TypeRequiresGCollection(QualType T) {
   // Only record types have members that might require garbage collection.
   const RecordType *RecordTy = T->getAs<RecordType>();
@@ -369,7 +369,7 @@
                         dest.isVolatile() || src.isVolatile());
 }
 
-/// \brief Emit the initializer for a std::initializer_list initialized with a
+/// Emit the initializer for a std::initializer_list initialized with a
 /// real initializer list.
 void
 AggExprEmitter::VisitCXXStdInitializerListExpr(CXXStdInitializerListExpr *E) {
@@ -434,7 +434,7 @@
   }
 }
 
-/// \brief Determine if E is a trivial array filler, that is, one that is
+/// Determine if E is a trivial array filler, that is, one that is
 /// equivalent to zero-initialization.
 static bool isTrivialFiller(Expr *E) {
   if (!E)
@@ -457,7 +457,7 @@
   return false;
 }
 
-/// \brief Emit initialization of an array from an initializer list.
+/// Emit initialization of an array from an initializer list.
 void AggExprEmitter::EmitArrayInit(Address DestPtr, llvm::ArrayType *AType,
                                    QualType ArrayQTy, InitListExpr *E) {
   uint64_t NumInitElements = E->getNumInits();