Add explicit C and C_VM modes

pytensor/compile/mode.py

@@ -461,6 +461,9 @@ else:
         RewriteDatabaseQuery(include=["fast_run", "py_only"]),
     )
 
+C = Mode("c", "fast_run")
+C_VM = Mode("cvm", "fast_run")
+
 NUMBA = Mode(
     NumbaLinker(),
     RewriteDatabaseQuery(
@@ -524,6 +527,8 @@ MLX = Mode(
 predefined_modes = {
     "FAST_COMPILE": FAST_COMPILE,
     "FAST_RUN": FAST_RUN,
+    "C": C,
+    "C_VM": C_VM,
     "JAX": JAX,
     "NUMBA": NUMBA,
     "PYTORCH": PYTORCH,

pytensor/configdefaults.py

@@ -45,6 +45,8 @@ def _filter_mode(val):
         "NanGuardMode",
         "FAST_COMPILE",
         "DEBUG_MODE",
+        "CVM",
+        "C",
         "JAX",
         "NUMBA",
         "PYTORCH",