[TEST] Enable test_frontend.py and install filecheck (#4423)

Fixes #4421

Signed-off-by: Whitney Tsang <[email protected]>

Author: whitneywhtsang

scripts/requirements-test.txt

@@ -1,4 +1,5 @@
 # Keep in sync with extra_require.tests from setup.py
+filecheck
 lit
 numpy
 pytest

scripts/test-triton.sh

@@ -275,9 +275,8 @@ run_minicore_tests() {
   cd $TRITON_PROJ/python/test/unit
   ensure_spirv_dis
 
-  # FIXME: Add back test_frontend.py, tracked in issue#4421.
   TRITON_DISABLE_LINE_INFO=1 TRITON_TEST_SUITE=language \
-    run_pytest_command -vvv -n ${PYTEST_MAX_PROCESSES:-8} --device xpu language/ --ignore=language/test_line_info.py --ignore=language/test_subprocess.py --ignore=language/test_warp_specialization.py --ignore=language/test_frontend.py \
+    run_pytest_command -vvv -n ${PYTEST_MAX_PROCESSES:-8} --device xpu language/ --ignore=language/test_line_info.py --ignore=language/test_subprocess.py --ignore=language/test_warp_specialization.py \
     -k "not test_mxfp and not test_scaled_dot"
 
   TRITON_DISABLE_LINE_INFO=1 TRITON_TEST_SUITE=subprocess \