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/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 2f7d414..99fd290 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -791,7 +791,7 @@
 using PredBlockVector = SmallVector<BasicBlock *, 16>;
 using IncomingValueMap = DenseMap<BasicBlock *, Value *>;
 
-/// \brief Determines the value to use as the phi node input for a block.
+/// Determines the value to use as the phi node input for a block.
 ///
 /// Select between \p OldVal any value that we know flows from \p BB
 /// to a particular phi on the basis of which one (if either) is not
@@ -820,7 +820,7 @@
   return OldVal;
 }
 
-/// \brief Create a map from block to value for the operands of a
+/// Create a map from block to value for the operands of a
 /// given phi.
 ///
 /// Create a map from block to value for each non-undef value flowing
@@ -839,7 +839,7 @@
   }
 }
 
-/// \brief Replace the incoming undef values to a phi with the values
+/// Replace the incoming undef values to a phi with the values
 /// from a block-to-value map.
 ///
 /// \param PN The phi we are replacing the undefs in.
@@ -859,7 +859,7 @@
   }
 }
 
-/// \brief Replace a value flowing from a block to a phi with
+/// Replace a value flowing from a block to a phi with
 /// potentially multiple instances of that value flowing from the
 /// block's predecessors to the phi.
 ///