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/CodeGen/AsmPrinter/DebugLocEntry.h b/llvm/lib/CodeGen/AsmPrinter/DebugLocEntry.h
index 6dff45d..ac49657 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DebugLocEntry.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DebugLocEntry.h
@@ -21,7 +21,7 @@
 namespace llvm {
 class AsmPrinter;
 
-/// \brief This struct describes location entries emitted in the .debug_loc
+/// This struct describes location entries emitted in the .debug_loc
 /// section.
 class DebugLocEntry {
   /// Begin and end symbols for the address range that this location is valid.
@@ -29,7 +29,7 @@
   const MCSymbol *End;
 
 public:
-  /// \brief A single location or constant.
+  /// A single location or constant.
   struct Value {
     Value(const DIExpression *Expr, int64_t i)
         : Expression(Expr), EntryKind(E_Integer) {
@@ -106,13 +106,13 @@
     Values.push_back(std::move(Val));
   }
 
-  /// \brief If this and Next are describing different pieces of the same
+  /// If this and Next are describing different pieces of the same
   /// variable, merge them by appending Next's values to the current
   /// list of values.
   /// Return true if the merge was successful.
   bool MergeValues(const DebugLocEntry &Next);
 
-  /// \brief Attempt to merge this DebugLocEntry with Next and return
+  /// Attempt to merge this DebugLocEntry with Next and return
   /// true if the merge was successful. Entries can be merged if they
   /// share the same Loc/Constant and if Next immediately follows this
   /// Entry.
@@ -136,7 +136,7 @@
         }) && "value must be a piece");
   }
 
-  // \brief Sort the pieces by offset.
+  // Sort the pieces by offset.
   // Remove any duplicate entries by dropping all but the first.
   void sortUniqueValues() {
     llvm::sort(Values.begin(), Values.end());
@@ -148,12 +148,12 @@
         Values.end());
   }
 
-  /// \brief Lower this entry into a DWARF expression.
+  /// Lower this entry into a DWARF expression.
   void finalize(const AsmPrinter &AP, DebugLocStream::ListBuilder &List,
                 const DIBasicType *BT);
 };
 
-/// \brief Compare two Values for equality.
+/// Compare two Values for equality.
 inline bool operator==(const DebugLocEntry::Value &A,
                        const DebugLocEntry::Value &B) {
   if (A.EntryKind != B.EntryKind)