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/InstCombine/InstCombineLoadStoreAlloca.cpp b/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
index 04119a9..b78de0f 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
@@ -440,7 +440,7 @@
   return Ty->isIntegerTy() || Ty->isPointerTy() || Ty->isFloatingPointTy();
 }
 
-/// \brief Helper to combine a load to a new type.
+/// Helper to combine a load to a new type.
 ///
 /// This just does the work of combining a load to a new type. It handles
 /// metadata, etc., and returns the new instruction. The \c NewTy should be the
@@ -507,7 +507,7 @@
   return NewLoad;
 }
 
-/// \brief Combine a store to a new type.
+/// Combine a store to a new type.
 ///
 /// Returns the newly created store instruction.
 static StoreInst *combineStoreToNewValue(InstCombiner &IC, StoreInst &SI, Value *V) {
@@ -584,7 +584,7 @@
           match(L2, m_Load(m_Specific(LHS))));
 }
 
-/// \brief Combine loads to match the type of their uses' value after looking
+/// Combine loads to match the type of their uses' value after looking
 /// through intervening bitcasts.
 ///
 /// The core idea here is that if the result of a load is used in an operation,
@@ -1087,7 +1087,7 @@
   return nullptr;
 }
 
-/// \brief Look for extractelement/insertvalue sequence that acts like a bitcast.
+/// Look for extractelement/insertvalue sequence that acts like a bitcast.
 ///
 /// \returns underlying value that was "cast", or nullptr otherwise.
 ///
@@ -1142,7 +1142,7 @@
   return U;
 }
 
-/// \brief Combine stores to match the type of value being stored.
+/// Combine stores to match the type of value being stored.
 ///
 /// The core idea here is that the memory does not have any intrinsic type and
 /// where we can we should match the type of a store to the type of value being