[Inductor] Fix cooperative reduction tests broken in recent refactor (pytorch#143135)

These tests were broken by pytorch#142020. This PR updates the fixed configs accordingly.

Pull Request resolved: pytorch#143135
Approved by: https://github.com/jansel, https://github.com/huydhn

Author: blaine-rister

test/inductor/test_cooperative_reductions.py

@@ -146,12 +146,12 @@ class TestFixedConfigs(TestCase):
     @parametrize(
         "persistent,cooperative,cfg",
         [
-            (False, False, {"XBLOCK": 1, "RBLOCK": 128}),
-            (False, False, {"XBLOCK": 2, "RBLOCK": 128}),
+            (False, False, {"XBLOCK": 1, "R0_BLOCK": 128}),
+            (False, False, {"XBLOCK": 2, "R0_BLOCK": 128}),
             (True, False, {"XBLOCK": 1}),
             (True, False, {"XBLOCK": 2}),
-            (False, True, {"XBLOCK": 1, "RBLOCK": 128, "RSPLIT": 16}),
-            (False, True, {"XBLOCK": 2, "RBLOCK": 128, "RSPLIT": 16}),
+            (False, True, {"XBLOCK": 1, "R0_BLOCK": 128, "RSPLIT": 16}),
+            (False, True, {"XBLOCK": 2, "R0_BLOCK": 128, "RSPLIT": 16}),
             (True, True, {"XBLOCK": 1, "RSPLIT": 16}),
             (True, True, {"XBLOCK": 2, "RSPLIT": 16}),
         ],