Remove \brief commands from doxygen comments.

This is similar to the LLVM change https://reviews.llvm.org/D46290.

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
for i in $(git grep -l '\\brief'); do perl -pi -e 's/\\brief //g' $i & done

Differential Revision: https://reviews.llvm.org/D46320

llvm-svn: 331834
diff --git a/clang/lib/CodeGen/CodeGenAction.cpp b/clang/lib/CodeGen/CodeGenAction.cpp
index 93e95a2..9b9f562 100644
--- a/clang/lib/CodeGen/CodeGenAction.cpp
+++ b/clang/lib/CodeGen/CodeGenAction.cpp
@@ -341,17 +341,17 @@
                                SourceLocation LocCookie);
 
     void DiagnosticHandlerImpl(const llvm::DiagnosticInfo &DI);
-    /// \brief Specialized handler for InlineAsm diagnostic.
+    /// Specialized handler for InlineAsm diagnostic.
     /// \return True if the diagnostic has been successfully reported, false
     /// otherwise.
     bool InlineAsmDiagHandler(const llvm::DiagnosticInfoInlineAsm &D);
-    /// \brief Specialized handler for StackSize diagnostic.
+    /// Specialized handler for StackSize diagnostic.
     /// \return True if the diagnostic has been successfully reported, false
     /// otherwise.
     bool StackSizeDiagHandler(const llvm::DiagnosticInfoStackSize &D);
-    /// \brief Specialized handler for unsupported backend feature diagnostic.
+    /// Specialized handler for unsupported backend feature diagnostic.
     void UnsupportedDiagHandler(const llvm::DiagnosticInfoUnsupported &D);
-    /// \brief Specialized handlers for optimization remarks.
+    /// Specialized handlers for optimization remarks.
     /// Note that these handlers only accept remarks and they always handle
     /// them.
     void EmitOptimizationMessage(const llvm::DiagnosticInfoOptimizationBase &D,
@@ -697,7 +697,7 @@
   EmitOptimizationMessage(D, diag::warn_fe_backend_optimization_failure);
 }
 
-/// \brief This function is invoked when the backend needs
+/// This function is invoked when the backend needs
 /// to report something to the user.
 void BackendConsumer::DiagnosticHandlerImpl(const DiagnosticInfo &DI) {
   unsigned DiagID = diag::err_fe_inline_asm;