[llvm-install-name-tool] Validate -id value early

The code which validates the value of -id is moved into the function parseInstallNameToolOptions.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D87855

Author: Alexander Shaposhnikov

llvm/tools/llvm-objcopy/CopyConfig.cpp

@@ -902,12 +902,15 @@ parseInstallNameToolOptions(ArrayRef<const char *> ArgsArr) {
     Config.RPathsToUpdate.insert({Old, New});
   }
 
-  if (auto *Arg = InputArgs.getLastArg(INSTALL_NAME_TOOL_id))
+  if (auto *Arg = InputArgs.getLastArg(INSTALL_NAME_TOOL_id)) {
     Config.SharedLibId = Arg->getValue();
+    if (Config.SharedLibId->empty())
+      return createStringError(errc::invalid_argument,
+                               "cannot specify an empty id");
+  }
 
-  for (auto *Arg : InputArgs.filtered(INSTALL_NAME_TOOL_change)) {
+  for (auto *Arg : InputArgs.filtered(INSTALL_NAME_TOOL_change))
     Config.InstallNamesToUpdate.insert({Arg->getValue(0), Arg->getValue(1)});
-  }
 
   SmallVector<StringRef, 2> Positional;
   for (auto Arg : InputArgs.filtered(INSTALL_NAME_TOOL_UNKNOWN))

llvm/tools/llvm-objcopy/MachO/MachOObjcopy.cpp

@@ -181,13 +181,9 @@ static Error processLoadCommands(const CopyConfig &Config, Object &Obj) {
   for (LoadCommand &LC : Obj.LoadCommands) {
     switch (LC.MachOLoadCommand.load_command_data.cmd) {
     case MachO::LC_ID_DYLIB:
-      if (Config.SharedLibId) {
-        StringRef Id = Config.SharedLibId.getValue();
-        if (Id.empty())
-          return createStringError(errc::invalid_argument,
-                                   "cannot specify an empty id");
-        updateLoadCommandPayloadString<MachO::dylib_command>(LC, Id);
-      }
+      if (Config.SharedLibId)
+        updateLoadCommandPayloadString<MachO::dylib_command>(
+            LC, *Config.SharedLibId);
       break;
 
     case MachO::LC_RPATH: {