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/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index 25c38c0..cdcb81b 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -588,7 +588,7 @@
   return ::SimplifyAddInst(Op0, Op1, isNSW, isNUW, Query, RecursionLimit);
 }
 
-/// \brief Compute the base pointer and cumulative constant offsets for V.
+/// Compute the base pointer and cumulative constant offsets for V.
 ///
 /// This strips all constant offsets off of V, leaving it the base pointer, and
 /// accumulates the total constant offset applied in the returned constant. It
@@ -639,7 +639,7 @@
   return OffsetIntPtr;
 }
 
-/// \brief Compute the constant difference between two pointer values.
+/// Compute the constant difference between two pointer values.
 /// If the difference is not a constant, returns zero.
 static Constant *computePointerDifference(const DataLayout &DL, Value *LHS,
                                           Value *RHS) {
@@ -1183,7 +1183,7 @@
   return nullptr;
 }
 
-/// \brief Given operands for an Shl, LShr or AShr, see if we can
+/// Given operands for an Shl, LShr or AShr, see if we can
 /// fold the result.  If not, this returns null.
 static Value *SimplifyRightShift(Instruction::BinaryOps Opcode, Value *Op0,
                                  Value *Op1, bool isExact, const SimplifyQuery &Q,
@@ -4931,7 +4931,7 @@
   return Result == I ? UndefValue::get(I->getType()) : Result;
 }
 
-/// \brief Implementation of recursive simplification through an instruction's
+/// Implementation of recursive simplification through an instruction's
 /// uses.
 ///
 /// This is the common implementation of the recursive simplification routines.