[lld] [lld-macho][NFC] Refactor ObjCSelRefsSection out of ObjCStubsSection (PR #83878)

[Kyungwoo Lee via llvm-commits]

================
@@ -806,26 +806,13 @@ void StubHelperSection::setUp() {
   dyldPrivate->used = true;
 }
 
-ObjCStubsSection::ObjCStubsSection()
-    : SyntheticSection(segment_names::text, section_names::objcStubs) {
-  flags = S_ATTR_SOME_INSTRUCTIONS | S_ATTR_PURE_INSTRUCTIONS;
-  align = config->objcStubsMode == ObjCStubsMode::fast
-              ? target->objcStubsFastAlignment
-              : target->objcStubsSmallAlignment;
-}
-
-bool ObjCStubsSection::isObjCStubSymbol(Symbol *sym) {
-  return sym->getName().starts_with(symbolPrefix);
-}
-
-StringRef ObjCStubsSection::getMethname(Symbol *sym) {
-  assert(isObjCStubSymbol(sym) && "not an objc stub");
-  auto name = sym->getName();
-  StringRef methname = name.drop_front(symbolPrefix.size());
-  return methname;
+ObjCSelRefsSection::ObjCSelRefsSection()
+    : SyntheticSection(segment_names::data, section_names::objcSelrefs) {
+  flags = S_ATTR_NO_DEAD_STRIP;
----------------
kyulee-com wrote:

Is this actually used? Perhaps not, as this section won't be written from here.

https://github.com/llvm/llvm-project/pull/83878