[ELF] Internalize enum

g++ -flto has a diagnostic `-Wodr` about mismatched redeclarations,
which even apply to `enum`.

Fix llvm#83529

Reviewers: thesamesam

Reviewed By: thesamesam

Pull Request: llvm#83604

(cherry picked from commit 4a3f7e7)

lld/ELF/Arch/LoongArch.cpp

@@ -41,6 +41,7 @@ class LoongArch final : public TargetInfo {
 };
 } // end anonymous namespace
 
+namespace {
 enum Op {
   SUB_W = 0x00110000,
   SUB_D = 0x00118000,
@@ -65,6 +66,7 @@ enum Reg {
   R_T2 = 14,
   R_T3 = 15,
 };
+} // namespace
 
 // Mask out the input's lowest 12 bits for use with `pcalau12i`, in sequences
 // like `pcalau12i + addi.[wd]` or `pcalau12i + {ld,st}.*` where the `pcalau12i`

lld/ELF/Arch/PPC64.cpp

@@ -26,6 +26,7 @@ using namespace lld::elf;
 constexpr uint64_t ppc64TocOffset = 0x8000;
 constexpr uint64_t dynamicThreadPointerOffset = 0x8000;
 
+namespace {
 // The instruction encoding of bits 21-30 from the ISA for the Xform and Dform
 // instructions that can be used as part of the initial exec TLS sequence.
 enum XFormOpcd {
@@ -139,6 +140,7 @@ enum class PPCPrefixedInsn : uint64_t {
   PSTXV = PREFIX_8LS | 0xd8000000,
   PSTXVP = PREFIX_8LS | 0xf8000000
 };
+
 static bool checkPPCLegacyInsn(uint32_t encoding) {
   PPCLegacyInsn insn = static_cast<PPCLegacyInsn>(encoding);
   if (insn == PPCLegacyInsn::NOINSN)
@@ -164,7 +166,6 @@ enum class LegacyToPrefixMask : uint64_t {
       0x8000000003e00000, // S/T (6-10) - The [S/T]X bit moves from 28 to 5.
 };
 
-namespace {
 class PPC64 final : public TargetInfo {
 public:
   PPC64();

lld/ELF/Arch/RISCV.cpp

@@ -57,6 +57,7 @@ class RISCV final : public TargetInfo {
 
 const uint64_t dtpOffset = 0x800;
 
+namespace {
 enum Op {
   ADDI = 0x13,
   AUIPC = 0x17,
@@ -78,6 +79,7 @@ enum Reg {
   X_A0 = 10,
   X_T3 = 28,
 };
+} // namespace
 
 static uint32_t hi20(uint32_t val) { return (val + 0x800) >> 12; }
 static uint32_t lo12(uint32_t val) { return val & 4095; }