[X86] Define shouldForceRelocation

Somehow needed by LTO/X86/cfi_jt_aliases.ll

Fixes: 6f6dc1f

Author: MaskRay

llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp

@@ -169,6 +169,9 @@ class X86AsmBackend : public MCAsmBackend {
 
   MCFixupKindInfo getFixupKindInfo(MCFixupKind Kind) const override;
 
+  bool shouldForceRelocation(const MCAssembler &, const MCFixup &,
+                             const MCValue &, const MCSubtargetInfo *) override;
+
   void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
                   const MCValue &Target, MutableArrayRef<char> Data,
                   uint64_t Value, bool IsResolved,
@@ -687,6 +690,12 @@ static unsigned getFixupKindSize(unsigned Kind) {
   }
 }
 
+bool X86AsmBackend::shouldForceRelocation(const MCAssembler &, const MCFixup &,
+                                          const MCValue &Target,
+                                          const MCSubtargetInfo *) {
+  return Target.getSpecifier();
+}
+
 void X86AsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
                                const MCValue &, MutableArrayRef<char> Data,
                                uint64_t Value, bool IsResolved,