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

llvm/lib/Bitcode/Reader/ValueList.cpp

@@ -32,7 +32,7 @@ namespace llvm {
 
 namespace {
 
-/// \brief A class for maintaining the slot number definition
+/// A class for maintaining the slot number definition
 /// as a placeholder for the actual definition for forward constants defs.
 class ConstantPlaceHolder : public ConstantExpr {
 public:
@@ -46,7 +46,7 @@ public:
   // allocate space for exactly one operand
   void *operator new(size_t s) { return User::operator new(s, 1); }
 
-  /// \brief Methods to support type inquiry through isa, cast, and dyn_cast.
+  /// Methods to support type inquiry through isa, cast, and dyn_cast.
   static bool classof(const Value *V) {
     return isa<ConstantExpr>(V) &&
            cast<ConstantExpr>(V)->getOpcode() == Instruction::UserOp1;