Update cheatsheets

tldr/lit

@@ -0,0 +1,26 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lit
+
+> LLVM integrated tester for executing LLVM and Clang style test suites, summarizing results.
+> Part of LLVM.
+> More information: <https://www.llvm.org/docs/CommandGuide/lit.html>.
+
+- Run a specified test case:
+
+`lit {{path/to/test_file.test}}`
+
+- Run all test cases in a specified directory:
+
+`lit {{path/to/test_suite}}`
+
+- Run all test cases and check the wall time for each cases, then report to summary output:
+
+`lit {{path/to/test_suite}} --time-tests`
+
+- Run individual tests with Valgrind (memory check and memory leak test):
+
+`lit {{path/to/test_file.test}} --vg --vg-leak --vg-args={{args_to_valgrind}}`