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/X86/X86TargetObjectFile.h b/llvm/lib/Target/X86/X86TargetObjectFile.h
index f6aa570..1907861 100644
--- a/llvm/lib/Target/X86/X86TargetObjectFile.h
+++ b/llvm/lib/Target/X86/X86TargetObjectFile.h
@@ -37,7 +37,7 @@
                                             MCStreamer &Streamer) const override;
   };
 
-  /// \brief This implemenatation is used for X86 ELF targets that don't
+  /// This implemenatation is used for X86 ELF targets that don't
   /// have a further specialization.
   class X86ELFTargetObjectFile : public TargetLoweringObjectFileELF {
   public:
@@ -45,7 +45,7 @@
       PLTRelativeVariantKind = MCSymbolRefExpr::VK_PLT;
     }
 
-    /// \brief Describe a TLS variable address within debug info.
+    /// Describe a TLS variable address within debug info.
     const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const override;
   };
 
@@ -55,7 +55,7 @@
     void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
   };
 
-  /// \brief This implementation is used for Fuchsia on x86-64.
+  /// This implementation is used for Fuchsia on x86-64.
   class X86FuchsiaTargetObjectFile : public X86ELFTargetObjectFile {
     void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
   };
@@ -66,18 +66,18 @@
     void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
   };
 
-  /// \brief This implementation is used for Solaris on x86/x86-64.
+  /// This implementation is used for Solaris on x86/x86-64.
   class X86SolarisTargetObjectFile : public X86ELFTargetObjectFile {
     void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
   };
 
-  /// \brief This implementation is used for Windows targets on x86 and x86-64.
+  /// This implementation is used for Windows targets on x86 and x86-64.
   class X86WindowsTargetObjectFile : public TargetLoweringObjectFileCOFF {
     const MCExpr *
     lowerRelativeReference(const GlobalValue *LHS, const GlobalValue *RHS,
                            const TargetMachine &TM) const override;
 
-    /// \brief Given a mergeable constant with the specified size and relocation
+    /// Given a mergeable constant with the specified size and relocation
     /// information, return a section that it should be placed in.
     MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
                                      const Constant *C,