[ELF] Replace noneRel = R_*_NONE with static constexpr. NFC

All architectures define R_*_NONE to 0.

lld/ELF/Arch/AArch64.cpp

@@ -62,7 +62,6 @@ AArch64::AArch64() {
   relativeRel = R_AARCH64_RELATIVE;
   iRelativeRel = R_AARCH64_IRELATIVE;
   gotRel = R_AARCH64_GLOB_DAT;
-  noneRel = R_AARCH64_NONE;
   pltRel = R_AARCH64_JUMP_SLOT;
   symbolicRel = R_AARCH64_ABS64;
   tlsDescRel = R_AARCH64_TLSDESC;

lld/ELF/Arch/AMDGPU.cpp

@@ -40,7 +40,6 @@ public:
 AMDGPU::AMDGPU() {
   relativeRel = R_AMDGPU_RELATIVE64;
   gotRel = R_AMDGPU_ABS64;
-  noneRel = R_AMDGPU_NONE;
   symbolicRel = R_AMDGPU_ABS64;
 }
 

lld/ELF/Arch/ARM.cpp

@@ -52,7 +52,6 @@ ARM::ARM() {
   relativeRel = R_ARM_RELATIVE;
   iRelativeRel = R_ARM_IRELATIVE;
   gotRel = R_ARM_GLOB_DAT;
-  noneRel = R_ARM_NONE;
   pltRel = R_ARM_JUMP_SLOT;
   symbolicRel = R_ARM_ABS32;
   tlsGotRel = R_ARM_TLS_TPOFF32;

lld/ELF/Arch/AVR.cpp

@@ -42,7 +42,6 @@ using namespace lld::elf;
 namespace {
 class AVR final : public TargetInfo {
 public:
-  AVR();
   uint32_t calcEFlags() const override;
   RelExpr getRelExpr(RelType type, const Symbol &s,
                      const uint8_t *loc) const override;
@@ -51,8 +50,6 @@ public:
 };
 } // namespace
 
-AVR::AVR() { noneRel = R_AVR_NONE; }
-
 RelExpr AVR::getRelExpr(RelType type, const Symbol &s,
                         const uint8_t *loc) const {
   switch (type) {

lld/ELF/Arch/Hexagon.cpp

@@ -54,7 +54,6 @@ Hexagon::Hexagon() {
 
   // Hexagon Linux uses 64K pages by default.
   defaultMaxPageSize = 0x10000;
-  noneRel = R_HEX_NONE;
   tlsGotRel = R_HEX_TPREL_32;
   tlsModuleIndexRel = R_HEX_DTPMOD_32;
   tlsOffsetRel = R_HEX_DTPREL_32;

lld/ELF/Arch/Mips.cpp

@@ -49,7 +49,6 @@ template <class ELFT> MIPS<ELFT>::MIPS() {
   pltEntrySize = 16;
   pltHeaderSize = 32;
   copyRel = R_MIPS_COPY;
-  noneRel = R_MIPS_NONE;
   pltRel = R_MIPS_JUMP_SLOT;
   needsThunks = true;
 

lld/ELF/Arch/PPC.cpp

@@ -151,7 +151,6 @@ void elf::writePPC32GlinkSection(uint8_t *buf, size_t numEntries) {
 PPC::PPC() {
   copyRel = R_PPC_COPY;
   gotRel = R_PPC_GLOB_DAT;
-  noneRel = R_PPC_NONE;
   pltRel = R_PPC_JMP_SLOT;
   relativeRel = R_PPC_RELATIVE;
   iRelativeRel = R_PPC_IRELATIVE;

lld/ELF/Arch/PPC64.cpp

@@ -568,7 +568,6 @@ static uint64_t readPrefixedInstruction(const uint8_t *loc) {
 PPC64::PPC64() {
   copyRel = R_PPC64_COPY;
   gotRel = R_PPC64_GLOB_DAT;
-  noneRel = R_PPC64_NONE;
   pltRel = R_PPC64_JMP_SLOT;
   relativeRel = R_PPC64_RELATIVE;
   iRelativeRel = R_PPC64_IRELATIVE;

lld/ELF/Arch/RISCV.cpp

@@ -75,7 +75,6 @@ static uint32_t utype(uint32_t op, uint32_t rd, uint32_t imm) {
 
 RISCV::RISCV() {
   copyRel = R_RISCV_COPY;
-  noneRel = R_RISCV_NONE;
   pltRel = R_RISCV_JUMP_SLOT;
   relativeRel = R_RISCV_RELATIVE;
   iRelativeRel = R_RISCV_IRELATIVE;

lld/ELF/Arch/SPARCV9.cpp

@@ -35,7 +35,6 @@ public:
 SPARCV9::SPARCV9() {
   copyRel = R_SPARC_COPY;
   gotRel = R_SPARC_GLOB_DAT;
-  noneRel = R_SPARC_NONE;
   pltRel = R_SPARC_JMP_SLOT;
   relativeRel = R_SPARC_RELATIVE;
   symbolicRel = R_SPARC_64;

lld/ELF/Arch/X86.cpp

@@ -52,7 +52,6 @@ public:
 X86::X86() {
   copyRel = R_386_COPY;
   gotRel = R_386_GLOB_DAT;
-  noneRel = R_386_NONE;
   pltRel = R_386_JUMP_SLOT;
   iRelativeRel = R_386_IRELATIVE;
   relativeRel = R_386_RELATIVE;

lld/ELF/Arch/X86_64.cpp

@@ -78,7 +78,6 @@ static const std::vector<std::vector<uint8_t>> nopInstructions = {
 X86_64::X86_64() {
   copyRel = R_X86_64_COPY;
   gotRel = R_X86_64_GLOB_DAT;
-  noneRel = R_X86_64_NONE;
   pltRel = R_X86_64_JUMP_SLOT;
   relativeRel = R_X86_64_RELATIVE;
   iRelativeRel = R_X86_64_IRELATIVE;

lld/ELF/Target.h

@@ -111,9 +111,9 @@ public:
   // True if _GLOBAL_OFFSET_TABLE_ is relative to .got.plt, false if .got.
   bool gotBaseSymInGotPlt = false;
 
+  static constexpr RelType noneRel = 0;
   RelType copyRel;
   RelType gotRel;
-  RelType noneRel;
   RelType pltRel;
   RelType relativeRel;
   RelType iRelativeRel;