[MC] Remove unneeded MC*AsmBackend::fixupNeedsRelaxation overrides

Follow-up to 88c0a82
("[MC] Make MCAsmBackend::fixupNeedsRelaxation not pure virtual").

Author: MaskRay

llvm/lib/Target/DirectX/MCTargetDesc/DirectXMCTargetDesc.cpp

@@ -92,12 +92,6 @@ class DXILAsmBackend : public MCAsmBackend {
                     const MCSubtargetInfo *STI) const override {
     return true;
   }
-
-  bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
-                            const MCRelaxableFragment *DF,
-                            const MCAsmLayout &Layout) const override {
-    return true;
-  }
 };
 
 class DirectXMCAsmInfo : public MCAsmInfo {

llvm/lib/Target/Lanai/MCTargetDesc/LanaiAsmBackend.cpp

@@ -56,13 +56,6 @@ class LanaiAsmBackend : public MCAsmBackend {
   std::unique_ptr<MCObjectTargetWriter>
   createObjectTargetWriter() const override;
 
-  // No instruction requires relaxation
-  bool fixupNeedsRelaxation(const MCFixup & /*Fixup*/, uint64_t /*Value*/,
-                            const MCRelaxableFragment * /*DF*/,
-                            const MCAsmLayout & /*Layout*/) const override {
-    return false;
-  }
-
   const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
 
   unsigned getNumFixupKinds() const override {

llvm/lib/Target/SPIRV/MCTargetDesc/SPIRVAsmBackend.cpp

@@ -30,13 +30,6 @@ class SPIRVAsmBackend : public MCAsmBackend {
     return createSPIRVObjectTargetWriter();
   }
 
-  // No instruction requires relaxation.
-  bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
-                            const MCRelaxableFragment *DF,
-                            const MCAsmLayout &Layout) const override {
-    return false;
-  }
-
   unsigned getNumFixupKinds() const override { return 1; }
 
   bool mayNeedRelaxation(const MCInst &Inst,

llvm/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp

@@ -305,16 +305,6 @@ namespace {
       }
     }
 
-    /// fixupNeedsRelaxation - Target specific predicate for whether a given
-    /// fixup requires the associated instruction to be relaxed.
-    bool fixupNeedsRelaxation(const MCFixup &Fixup,
-                              uint64_t Value,
-                              const MCRelaxableFragment *DF,
-                              const MCAsmLayout &Layout) const override {
-      // FIXME.
-      llvm_unreachable("fixupNeedsRelaxation() unimplemented");
-      return false;
-    }
     void relaxInstruction(MCInst &Inst,
                           const MCSubtargetInfo &STI) const override {
       // FIXME.

llvm/lib/Target/VE/MCTargetDesc/VEAsmBackend.cpp

@@ -153,16 +153,6 @@ class VEAsmBackend : public MCAsmBackend {
     return false;
   }
 
-  /// fixupNeedsRelaxation - Target specific predicate for whether a given
-  /// fixup requires the associated instruction to be relaxed.
-  bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
-                            const MCRelaxableFragment *DF,
-                            const MCAsmLayout &Layout) const override {
-    // Not implemented yet.  For example, if we have a branch with
-    // lager than SIMM32 immediate value, we want to relaxation such
-    // branch instructions.
-    return false;
-  }
   void relaxInstruction(MCInst &Inst,
                         const MCSubtargetInfo &STI) const override {
     // Aurora VE doesn't support relaxInstruction yet.