[lld] [lld][macho] Support 1-byte branch relocs for x86_64 (PR #164439)

[Ellis Hoag via llvm-commits]

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@@ -84,6 +84,8 @@ int64_t X86_64::getEmbeddedAddend(MemoryBufferRef mb, uint64_t offset,
   const uint8_t *loc = buf + offset + rel.r_address;
 
   switch (rel.r_length) {
+  case 0:
+    return *loc + pcrelOffset(rel.r_type);
   case 2:
     return static_cast<int32_t>(read32le(loc)) + pcrelOffset(rel.r_type);
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ellishg wrote:

Oh that makes sense. In that case, can the single byte addend be negative? I believe it's read as an unsigned byte currently.

https://github.com/llvm/llvm-project/pull/164439