[llvm] [CI] Test lit when it is changed (PR #159359)

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``````````diff
--- compute_projects.py	2025-09-17 13:35:25.000000 +0000
+++ compute_projects.py	2025-09-17 13:40:52.768455 +0000
@@ -165,11 +165,11 @@
     ("clang", "include", "clang", "CIR"): "CIR",
     ("*", "docs"): "docs",
     ("llvm", "utils", "gn"): "gn",
     (".github", "workflows", "premerge.yaml"): ".ci",
     ("third-party",): ".ci",
-    ("llvm", "utils", "lit"): "lit"
+    ("llvm", "utils", "lit"): "lit",
 }
 
 # Projects that should run tests but cannot be explicitly built.
 SKIP_BUILD_PROJECTS = ["CIR", "lit"]
 

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https://github.com/llvm/llvm-project/pull/159359