gh-115816: Generate calls to sym_new_const() etc. without _Py_uop prefix (#116077)

This was left behind by GH-115987. Basically a lot of diffs like this:
```
-            res = _Py_uop_sym_new_unknown(ctx);
+            res = sym_new_unknown(ctx);
```

Author: gvanrossum

Lib/test/test_generated_cases.py

@@ -900,7 +900,7 @@ def test_overridden_abstract_args(self):
 
         case OP2: {
             _Py_UopsSymbol *out;
-            out = _Py_uop_sym_new_unknown(ctx);
+            out = sym_new_unknown(ctx);
             if (out == NULL) goto out_of_space;
             stack_pointer[-1] = out;
             break;
@@ -925,7 +925,7 @@ def test_no_overridden_case(self):
         output = """
         case OP: {
             _Py_UopsSymbol *out;
-            out = _Py_uop_sym_new_unknown(ctx);
+            out = sym_new_unknown(ctx);
             if (out == NULL) goto out_of_space;
             stack_pointer[-1] = out;
             break;