MCSection: Remove empty printSwitchToSection overrides

Author: MaskRay

llvm/include/llvm/MC/MCSection.h

@@ -650,7 +650,7 @@ class LLVM_ABI MCSection {
 
   virtual void printSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
                                     raw_ostream &OS,
-                                    uint32_t Subsection) const = 0;
+                                    uint32_t Subsection) const {}
 
   /// Check whether this section is "virtual", that is has no actual object
   /// file contents.

llvm/include/llvm/MC/MCSectionDXContainer.h

@@ -25,10 +25,6 @@ class MCSectionDXContainer final : public MCSection {
 
   MCSectionDXContainer(StringRef Name, SectionKind K, MCSymbol *Begin)
       : MCSection(Name, K.isText(), /*IsVirtual=*/false, Begin) {}
-
-public:
-  void printSwitchToSection(const MCAsmInfo &, const Triple &, raw_ostream &,
-                            uint32_t) const override;
 };
 
 } // end namespace llvm

llvm/include/llvm/MC/MCSectionSPIRV.h

@@ -18,21 +18,13 @@
 
 namespace llvm {
 
-class MCSymbol;
-
 class MCSectionSPIRV final : public MCSection {
   friend class MCContext;
 
   MCSectionSPIRV()
       : MCSection("", /*IsText=*/true, /*IsVirtual=*/false,
                   /*Begin=*/nullptr) {}
   // TODO: Add StringRef Name to MCSectionSPIRV.
-
-public:
-  ~MCSectionSPIRV() = default;
-  void printSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
-                            raw_ostream &OS,
-                            uint32_t Subsection) const override {}
 };
 
 } // end namespace llvm

llvm/lib/MC/CMakeLists.txt

@@ -44,7 +44,6 @@ add_llvm_component_library(LLVMMC
   MCSchedule.cpp
   MCSection.cpp
   MCSectionCOFF.cpp
-  MCSectionDXContainer.cpp
   MCSectionELF.cpp
   MCSectionGOFF.cpp
   MCSectionMachO.cpp