[lld] [ELF] Add target-specific relocation scanning for PPC64 (PR #181496)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- lld/ELF/Arch/PPC64.cpp lld/ELF/InputSection.cpp lld/ELF/Relocations.cpp lld/ELF/Relocations.h --diff_from_common_commit
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``````````diff
diff --git a/lld/ELF/Arch/PPC64.cpp b/lld/ELF/Arch/PPC64.cpp
index 09107efd7..6f5412427 100644
--- a/lld/ELF/Arch/PPC64.cpp
+++ b/lld/ELF/Arch/PPC64.cpp
@@ -616,7 +616,6 @@ PPC64::PPC64(Ctx &ctx) : TargetInfo(ctx) {
   write32(ctx, trapInstr.data(), 0x7fe00008);
 }
 
-
 static uint32_t getEFlags(InputFile *file) {
   if (file->ekind == ELF64BEKind)
     return cast<ObjFile<ELF64BE>>(file)->getObj().getHeader().e_flags;
@@ -1664,7 +1663,6 @@ bool PPC64::inBranchRange(RelType type, uint64_t src, uint64_t dst) const {
   llvm_unreachable("unsupported relocation type used in branch");
 }
 
-
 RelExpr PPC64::adjustGotPcExpr(RelType type, int64_t addend,
                                const uint8_t *loc) const {
   if ((type == R_PPC64_GOT_PCREL34 || type == R_PPC64_PCREL_OPT) &&

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https://github.com/llvm/llvm-project/pull/181496