Add -fuse-lipo option

Author: khyperia

clang/include/clang/Driver/Options.td

@@ -6654,6 +6654,7 @@ def fbinutils_version_EQ : Joined<["-"], "fbinutils-version=">,
 def fuse_ld_EQ : Joined<["-"], "fuse-ld=">, Group<f_Group>,
   Flags<[LinkOption]>, Visibility<[ClangOption, FlangOption, CLOption]>;
 def ld_path_EQ : Joined<["--"], "ld-path=">, Group<Link_Group>;
+def fuse_lipo_EQ : Joined<["-"], "fuse-lipo=">, Group<f_clang_Group>, Flags<[LinkOption]>;
 
 defm align_labels : BooleanFFlag<"align-labels">, Group<clang_ignored_gcc_optimization_f_Group>;
 def falign_labels_EQ : Joined<["-"], "falign-labels=">, Group<clang_ignored_gcc_optimization_f_Group>;

clang/lib/Driver/ToolChains/Darwin.cpp

@@ -910,7 +910,8 @@ void darwin::Lipo::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back(II.getFilename());
   }
 
-  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("lipo"));
+  std::string LipoName = std::string(Args.getLastArgValue(options::OPT_fuse_lipo_EQ, "lipo"));
+  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath(LipoName.c_str()));
   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
                                          Exec, CmdArgs, Inputs, Output));
 }