Reorganize how tb infrstructure selects toolchains

tests/lib/synthesizers/vivado.py

@@ -0,0 +1,29 @@
+import os
+import subprocess
+import shutil
+
+from .base import Synthesizer
+
+class Vivado(Synthesizer):
+    name = "vivado"
+
+    @classmethod
+    def is_installed(cls) -> bool:
+        return shutil.which("vivado") is not None
+
+    def run(self) -> None:
+        script = os.path.join(
+            os.path.dirname(__file__),
+            "vivado_scripts/run.tcl"
+        )
+
+        cmd = [
+            "vivado", "-nojournal", "-notrace",
+            "-mode", "batch",
+            "-log", "out.log",
+            "-source", script,
+            "-tclargs"
+        ]
+        cmd.extend(self.testcase._get_synth_files())
+
+        subprocess.run(cmd, check=True)