Use lld-link with clang-cl

Use lld-link dynamic linker with clang-cl
Don't hardcode dynamic linker name in tests

mesonbuild/compilers/c.py

@@ -1345,7 +1345,12 @@ class VisualStudioCCompiler(CCompiler):
         return []
 
     def get_linker_exelist(self):
-        return ['link'] # FIXME, should have same path as compiler.
+        # FIXME, should have same path as compiler.
+        # FIXME, should be controllable via cross-file.
+        if self.id == 'clang-cl':
+            return ['lld-link']
+        else:
+            return ['link']
 
     def get_linker_always_args(self):
         return ['/nologo']

run_unittests.py

@@ -2050,8 +2050,9 @@ int main(int argc, char **argv) {
         if extra_args is None:
             extra_args = []
         if compiler.get_argument_syntax() == 'msvc':
-            link_cmd = ['link', '/NOLOGO', '/DLL', '/DEBUG',
-                        '/IMPLIB:' + impfile, '/OUT:' + outfile, objectfile]
+            link_cmd = compiler.get_linker_exelist() + [
+                '/NOLOGO', '/DLL', '/DEBUG', '/IMPLIB:' + impfile,
+                '/OUT:' + outfile, objectfile]
         else:
             extra_args += ['-fPIC']
             link_cmd = compiler.get_exelist() + ['-shared', '-o', outfile, objectfile]