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/AMDGPU/Utils/AMDGPUBaseInfo.cpp b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
index 8f687fd..74dac65 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
@@ -53,7 +53,7 @@
   return ((1 << Width) - 1) << Shift;
 }
 
-/// \brief Packs \p Src into \p Dst for given bit \p Shift and bit \p Width.
+/// Packs \p Src into \p Dst for given bit \p Shift and bit \p Width.
 ///
 /// \returns Packed \p Dst.
 unsigned packBits(unsigned Src, unsigned Dst, unsigned Shift, unsigned Width) {
@@ -62,7 +62,7 @@
   return Dst;
 }
 
-/// \brief Unpacks bits from \p Src for given bit \p Shift and bit \p Width.
+/// Unpacks bits from \p Src for given bit \p Shift and bit \p Width.
 ///
 /// \returns Unpacked bits.
 unsigned unpackBits(unsigned Src, unsigned Shift, unsigned Width) {