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/DIEHash.h b/llvm/lib/CodeGen/AsmPrinter/DIEHash.h
index 29337ae..85f2fea 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DIEHash.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DIEHash.h
@@ -23,7 +23,7 @@
 class AsmPrinter;
 class CompileUnit;
 
-/// \brief An object containing the capability of hashing and adding hash
+/// An object containing the capability of hashing and adding hash
 /// attributes onto a DIE.
 class DIEHash {
   // Collection of all attributes used in hashing a particular DIE.
@@ -35,66 +35,66 @@
 public:
   DIEHash(AsmPrinter *A = nullptr) : AP(A) {}
 
-  /// \brief Computes the CU signature.
+  /// Computes the CU signature.
   uint64_t computeCUSignature(StringRef DWOName, const DIE &Die);
 
-  /// \brief Computes the type signature.
+  /// Computes the type signature.
   uint64_t computeTypeSignature(const DIE &Die);
 
   // Helper routines to process parts of a DIE.
 private:
-  /// \brief Adds the parent context of \param Die to the hash.
+  /// Adds the parent context of \param Die to the hash.
   void addParentContext(const DIE &Die);
 
-  /// \brief Adds the attributes of \param Die to the hash.
+  /// Adds the attributes of \param Die to the hash.
   void addAttributes(const DIE &Die);
 
-  /// \brief Computes the full DWARF4 7.27 hash of the DIE.
+  /// Computes the full DWARF4 7.27 hash of the DIE.
   void computeHash(const DIE &Die);
 
   // Routines that add DIEValues to the hash.
 public:
-  /// \brief Adds \param Value to the hash.
+  /// Adds \param Value to the hash.
   void update(uint8_t Value) { Hash.update(Value); }
 
-  /// \brief Encodes and adds \param Value to the hash as a ULEB128.
+  /// Encodes and adds \param Value to the hash as a ULEB128.
   void addULEB128(uint64_t Value);
 
-  /// \brief Encodes and adds \param Value to the hash as a SLEB128.
+  /// Encodes and adds \param Value to the hash as a SLEB128.
   void addSLEB128(int64_t Value);
 
 private:
-  /// \brief Adds \param Str to the hash and includes a NULL byte.
+  /// Adds \param Str to the hash and includes a NULL byte.
   void addString(StringRef Str);
 
-  /// \brief Collects the attributes of DIE \param Die into the \param Attrs
+  /// Collects the attributes of DIE \param Die into the \param Attrs
   /// structure.
   void collectAttributes(const DIE &Die, DIEAttrs &Attrs);
 
-  /// \brief Hashes the attributes in \param Attrs in order.
+  /// Hashes the attributes in \param Attrs in order.
   void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
 
-  /// \brief Hashes the data in a block like DIEValue, e.g. DW_FORM_block or
+  /// Hashes the data in a block like DIEValue, e.g. DW_FORM_block or
   /// DW_FORM_exprloc.
   void hashBlockData(const DIE::const_value_range &Values);
 
-  /// \brief Hashes the contents pointed to in the .debug_loc section.
+  /// Hashes the contents pointed to in the .debug_loc section.
   void hashLocList(const DIELocList &LocList);
 
-  /// \brief Hashes an individual attribute.
+  /// Hashes an individual attribute.
   void hashAttribute(const DIEValue &Value, dwarf::Tag Tag);
 
-  /// \brief Hashes an attribute that refers to another DIE.
+  /// Hashes an attribute that refers to another DIE.
   void hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
                     const DIE &Entry);
 
-  /// \brief Hashes a reference to a named type in such a way that is
+  /// Hashes a reference to a named type in such a way that is
   /// independent of whether that type is described by a declaration or a
   /// definition.
   void hashShallowTypeReference(dwarf::Attribute Attribute, const DIE &Entry,
                                 StringRef Name);
 
-  /// \brief Hashes a reference to a previously referenced type DIE.
+  /// Hashes a reference to a previously referenced type DIE.
   void hashRepeatedTypeReference(dwarf::Attribute Attribute,
                                  unsigned DieNumber);