[CI] Test All Projects On Workflow Changes

This patch makes it so that we actually run all the tests when we touch
the workflow file in .github/workflows/premerge.yaml. Before this we
would not run any tests and it was annoying to have to manually touch a
file to get something to trigger.

Reviewers: Keenuts, lnihlen, cmtice, dschuff, gburgessiv

Reviewed By: gburgessiv

Pull Request: llvm/llvm-project#150250

Author: boomanaiden154

.ci/compute_projects.py

@@ -154,6 +154,7 @@
     ("clang", "include", "clang", "CIR"): "CIR",
     ("*", "docs"): "docs",
     ("llvm", "utils", "gn"): "gn",
+    (".github", "workflows", "premerge.yaml"): ".ci",
 }
 
 # Projects that should not run any tests. These need to be metaprojects.

.ci/compute_projects_test.py

@@ -308,6 +308,41 @@ def test_clang_tools_extra(self):
         self.assertEqual(env_variables["runtimes_check_targets"], "check-libc")
         self.assertEqual(env_variables["runtimes_check_targets_needs_reconfig"], "")
 
+    def test_premerge_workflow(self):
+        env_variables = compute_projects.get_env_variables(
+            [".github/workflows/premerge.yaml"], "Linux"
+        )
+        self.assertEqual(
+            env_variables["projects_to_build"],
+            "bolt;clang;clang-tools-extra;flang;libclc;lld;lldb;llvm;mlir;polly",
+        )
+        self.assertEqual(
+            env_variables["project_check_targets"],
+            "check-bolt check-clang check-clang-cir check-clang-tools check-flang check-lld check-lldb check-llvm check-mlir check-polly",
+        )
+        self.assertEqual(
+            env_variables["runtimes_to_build"],
+            "compiler-rt;libc;libcxx;libcxxabi;libunwind",
+        )
+        self.assertEqual(
+            env_variables["runtimes_check_targets"],
+            "check-compiler-rt check-libc",
+        )
+        self.assertEqual(
+            env_variables["runtimes_check_targets_needs_reconfig"],
+            "check-cxx check-cxxabi check-unwind",
+        )
+
+    def test_other_github_workflow(self):
+        env_variables = compute_projects.get_env_variables(
+            [".github/workflows/docs.yml"], "Linux"
+        )
+        self.assertEqual(env_variables["projects_to_build"], "")
+        self.assertEqual(env_variables["project_check_targets"], "")
+        self.assertEqual(env_variables["runtimes_to_build"], "")
+        self.assertEqual(env_variables["runtimes_check_targets"], "")
+        self.assertEqual(env_variables["runtimes_check_targets_needs_reconfig"], "")
+
 
 if __name__ == "__main__":
     unittest.main()