[test] Add check-flang-long target for running NCAR tests via make

Also update the GitHub workflows to run `check-flang-long` instead of
`check-all`. The latter remains synonymous to `check-flang`, which
skips the NCAR kernel tests as UNSUPPORTED.

.github/workflows/build_flang.yml

@@ -86,7 +86,7 @@ jobs:
       - name: Test flang
         run: |
           cd build/flang
-          make check-all
+          make check-flang-long
 
       # Archive documentation just once, for the fastest job.
       - if: matrix.cc == 'clang' && matrix.version == '11'

.github/workflows/build_flang_arm64.yml

@@ -64,4 +64,4 @@ jobs:
       - name: Test flang
         run: |
           cd ${{ env.build_path }}/flang/build/flang
-          make check-all
+          make check-flang-long

test/CMakeLists.txt

@@ -66,6 +66,15 @@ add_lit_testsuite(check-flang "Running Flang regression tests"
   )
 set_target_properties(check-flang PROPERTIES FOLDER "Flang tests")
 
+add_lit_testsuite(check-flang-long "Running time-consuming Flang regression tests"
+  ${CMAKE_CURRENT_BINARY_DIR}
+  EXCLUDE_FROM_CHECK_ALL
+  PARAMS "${FLANG_TEST_PARAMS};run_long_tests=true"
+  DEPENDS ${FLANG_TEST_DEPS}
+  ARGS ${FLANG_TEST_EXTRA_ARGS}
+  )
+set_target_properties(check-flang-long PROPERTIES FOLDER "Flang tests")
+
 add_lit_testsuites(FLANG ${CMAKE_CURRENT_SOURCE_DIR}
   PARAMS ${FLANG_TEST_PARAMS}
   DEPENDS ${FLANG_TEST_DEPS}