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/Loads.cpp b/llvm/lib/Analysis/Loads.cpp
index 9be8456..10a71de 100644
--- a/llvm/lib/Analysis/Loads.cpp
+++ b/llvm/lib/Analysis/Loads.cpp
@@ -156,7 +156,7 @@
   return isDereferenceableAndAlignedPointer(V, 1, DL, CtxI, DT);
 }
 
-/// \brief Test if A and B will obviously have the same value.
+/// Test if A and B will obviously have the same value.
 ///
 /// This includes recognizing that %t0 and %t1 will have the same
 /// value in code like this:
@@ -187,7 +187,7 @@
   return false;
 }
 
-/// \brief Check if executing a load of this pointer value cannot trap.
+/// Check if executing a load of this pointer value cannot trap.
 ///
 /// If DT and ScanFrom are specified this method performs context-sensitive
 /// analysis and returns true if it is safe to load immediately before ScanFrom.