d: Prefer MSVC and LLVM linker over optlink when available

The optlink linker is slowly getting phased out now since DMD ships with the LLVM linker, so it can be used when Visual Studio is not installed.

mesonbuild/environment.py

@@ -1369,12 +1369,15 @@ class Environment:
             # LDC seems to require a file
             m = self.machines[for_machine]
             if m.is_windows() or m.is_cygwin():
-                # Getting LDC on windows to give useful linker output when not
+                if is_msvc:
-                # doing real work is painfully hard. It ships with a verison of
+                    linker = MSVCDynamicLinker(for_machine, version=version)
-                # lld-link, so just assume that we're going to use lld-link
+                else:
-                # with it.
+                    # Getting LDC on windows to give useful linker output when not
-                _, o, _ = Popen_safe(['lld-link.exe', '--version'])
+                    # doing real work is painfully hard. It ships with a verison of
-                linker = ClangClDynamicLinker(for_machine, version=search_version(o))
+                    # lld-link, so just assume that we're going to use lld-link
+                    # with it.
+                    _, o, _ = Popen_safe(['lld-link.exe', '--version'])
+                    linker = ClangClDynamicLinker(for_machine, version=search_version(o))
             else:
                 with tempfile.NamedTemporaryFile(suffix='.d') as f:
                     linker = self._guess_nix_linker(
@@ -1393,7 +1396,14 @@ class Environment:
             # DMD seems to require a file
             m = self.machines[for_machine]
             if m.is_windows() or m.is_cygwin():
-                linker = OptlinkDynamicLinker(for_machine, version=full_version)
+                if is_msvc:
+                    linker = MSVCDynamicLinker(for_machine, version=version)
+                elif arch == 'x86':
+                    linker = OptlinkDynamicLinker(for_machine, version=full_version)
+                else:
+                    # DMD ships with lld-link
+                    _, o, _ = Popen_safe(['lld-link.exe', '--version'])
+                    linker = ClangClDynamicLinker(for_machine, version=search_version(o))
             else:
                 with tempfile.NamedTemporaryFile(suffix='.d') as f:
                     linker = self._guess_nix_linker(