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/ExecutionEngine/ExecutionEngine.cpp b/llvm/lib/ExecutionEngine/ExecutionEngine.cpp
index e4efc15..2cc6c46 100644
--- a/llvm/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/llvm/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -96,14 +96,14 @@
 }
 
 namespace {
-/// \brief Helper class which uses a value handler to automatically deletes the
+/// Helper class which uses a value handler to automatically deletes the
 /// memory block when the GlobalVariable is destroyed.
 class GVMemoryBlock final : public CallbackVH {
   GVMemoryBlock(const GlobalVariable *GV)
     : CallbackVH(const_cast<GlobalVariable*>(GV)) {}
 
 public:
-  /// \brief Returns the address the GlobalVariable should be written into.  The
+  /// Returns the address the GlobalVariable should be written into.  The
   /// GVMemoryBlock object prefixes that.
   static char *Create(const GlobalVariable *GV, const DataLayout& TD) {
     Type *ElTy = GV->getValueType();
@@ -589,7 +589,7 @@
   return getPointerToGlobalIfAvailable(GV);
 }
 
-/// \brief Converts a Constant* into a GenericValue, including handling of
+/// Converts a Constant* into a GenericValue, including handling of
 /// ConstantExpr values.
 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
   // If its undefined, return the garbage.