Restore -Xlinker for clang-cl

Author: Maetveis

clang/include/clang/Driver/Options.td

@@ -1055,7 +1055,7 @@ def z : Separate<["-"], "z">, Flags<[LinkerInput]>,
 def offload_link : Flag<["--"], "offload-link">, Group<Link_Group>,
   HelpText<"Use the new offloading linker to perform the link job.">;
 def Xlinker : Separate<["-"], "Xlinker">, Flags<[LinkerInput, RenderAsInput]>,
-  Visibility<[ClangOption, FlangOption]>,
+  Visibility<[ClangOption, CLOption, FlangOption]>,
   HelpText<"Pass <arg> to the linker">, MetaVarName<"<arg>">,
   Group<Link_Group>;
 def Xoffload_linker : JoinedAndSeparate<["-"], "Xoffload-linker">,

clang/test/Driver/unknown-arg-drivermodes.test

@@ -9,7 +9,6 @@
 // RUN: -shared                    \
 // RUN: -static                    \
 // RUN: -stdlib                    \
-// RUN: -Xlinker                   \
 // RUN: -Xoffload-linker           \
 // RUN: -### -x c++ -c - < /dev/null 2>&1 | FileCheck %s --check-prefix=CL
 
@@ -38,7 +37,6 @@
 // CL: warning: unknown argument ignored in clang-cl: '-shared'
 // CL: warning: unknown argument ignored in clang-cl: '-static'
 // CL: warning: unknown argument ignored in clang-cl: '-stdlib'
-// CL: warning: unknown argument ignored in clang-cl: '-Xlinker'
 // CL: warning: unknown argument ignored in clang-cl: '-Xoffload-linker'
 
 // DXC: error: unknown argument: '--config'