[MC] Remove unused getMemtagRelocsSection

Follow-up to fec1b6f

Author: MaskRay

llvm/include/llvm/MC/MCELFObjectWriter.h

@@ -137,14 +137,6 @@ class MCELFObjectTargetWriter : public MCObjectTargetWriter {
   unsigned setRSsym(unsigned Value, unsigned Type) const {
     return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT);
   }
-
-  // On AArch64, return a new section to be added to the ELF object that
-  // contains relocations used to describe every symbol that should have memory
-  // tags applied. Returns nullptr if no such section is necessary (i.e. there's
-  // no tagged globals).
-  virtual MCSectionELF *getMemtagRelocsSection(MCContext &Ctx) const {
-    return nullptr;
-  }
 };
 
 class ELFObjectWriter final : public MCObjectWriter {

llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFObjectWriter.cpp

@@ -34,8 +34,6 @@ class AArch64ELFObjectWriter : public MCELFObjectTargetWriter {
 
   ~AArch64ELFObjectWriter() override = default;
 
-  MCSectionELF *getMemtagRelocsSection(MCContext &Ctx) const override;
-
 protected:
   unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
                         const MCFixup &Fixup, bool IsPCRel) const override;
@@ -462,12 +460,6 @@ bool AArch64ELFObjectWriter::needsRelocateWithSymbol(const MCValue &Val,
   return (Val.getRefKind() & AArch64MCExpr::VK_GOT) == AArch64MCExpr::VK_GOT;
 }
 
-MCSectionELF *
-AArch64ELFObjectWriter::getMemtagRelocsSection(MCContext &Ctx) const {
-  return Ctx.getELFSection(".memtag.globals.static",
-                           ELF::SHT_AARCH64_MEMTAG_GLOBALS_STATIC, 0);
-}
-
 std::unique_ptr<MCObjectTargetWriter>
 llvm::createAArch64ELFObjectWriter(uint8_t OSABI, bool IsILP32) {
   return std::make_unique<AArch64ELFObjectWriter>(OSABI, IsILP32);