[mlir][bzl] Add CAPIIndex rule. (#144248)

Author: jpienaar

utils/bazel/llvm-project-overlay/mlir/BUILD.bazel

@@ -535,6 +535,23 @@ mlir_c_api_cc_library(
     ],
 )
 
+mlir_c_api_cc_library(
+    name = "CAPIIndex",
+    srcs = [
+        "lib/CAPI/Dialect/Index.cpp",
+    ],
+    hdrs = [
+        "include/mlir-c/Dialect/Index.h",
+    ],
+    capi_deps = [
+        ":CAPIIR",
+    ],
+    includes = ["include"],
+    deps = [
+        ":IndexDialect",
+    ],
+)
+
 mlir_c_api_cc_library(
     name = "CAPILinalg",
     srcs = [