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/Target/ARM/ARMISelLowering.h b/llvm/lib/Target/ARM/ARMISelLowering.h
index 20e323b..3986884 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.h
+++ b/llvm/lib/Target/ARM/ARMISelLowering.h
@@ -354,7 +354,7 @@
 
     bool isLegalT2ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
 
-    /// \brief Returns true if the addresing mode representing by AM is legal
+    /// Returns true if the addresing mode representing by AM is legal
     /// for the Thumb1 target, for a load/store of the specified type.
     bool isLegalT1ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
 
@@ -482,7 +482,7 @@
                             MachineFunction &MF,
                             unsigned Intrinsic) const override;
 
-    /// \brief Returns true if it is beneficial to convert a load of a constant
+    /// Returns true if it is beneficial to convert a load of a constant
     /// to just the constant itself.
     bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
                                            Type *Ty) const override;
@@ -492,7 +492,7 @@
     bool isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
                                  unsigned Index) const override;
 
-    /// \brief Returns true if an argument of type Ty needs to be passed in a
+    /// Returns true if an argument of type Ty needs to be passed in a
     /// contiguous block of registers in calling convention CallConv.
     bool functionArgumentNeedsConsecutiveRegisters(
         Type *Ty, CallingConv::ID CallConv, bool isVarArg) const override;