[fusl] Add llvm's lit tool to third_party

third_party/lit/tests/shtest-format.py

+# Check the various features of the ShTest format.
+#
+# RUN: not %{lit} -j 1 -v %{inputs}/shtest-format > %t.out
+# RUN: FileCheck < %t.out %s
+#
+# END.
+
+# CHECK: -- Testing:
+
+# CHECK: PASS: shtest-format :: argv0.txt
+# CHECK: FAIL: shtest-format :: external_shell/fail.txt
+# CHECK-NEXT: *** TEST 'shtest-format :: external_shell/fail.txt' FAILED ***
+# CHECK: Command Output (stdout):
+# CHECK-NEXT: --
+# CHECK-NEXT: line 1: failed test output on stdout
+# CHECK-NEXT: line 2: failed test output on stdout
+# CHECK: Command Output (stderr):
+# CHECK-NEXT: --
+# CHECK-NEXT: cat: does-not-exist: No such file or directory
+# CHECK: --
+
+# CHECK: FAIL: shtest-format :: external_shell/fail_with_bad_encoding.txt
+# CHECK-NEXT: *** TEST 'shtest-format :: external_shell/fail_with_bad_encoding.txt' FAILED ***
+# CHECK: Command Output (stdout):
+# CHECK-NEXT: --
+# CHECK-NEXT: a line with bad encoding:
+# CHECK: --
+
+# CHECK: PASS: shtest-format :: external_shell/pass.txt
+
+# CHECK: FAIL: shtest-format :: fail.txt
+# CHECK-NEXT: *** TEST 'shtest-format :: fail.txt' FAILED ***
+# CHECK-NEXT: Script:
+# CHECK-NEXT: --
+# CHECK-NEXT: printf "line 1
+# CHECK-NEXT: false
+# CHECK-NEXT: --
+# CHECK-NEXT: Exit Code: 1
+#
+# CHECK: Command Output (stdout):
+# CHECK-NEXT: --
+# CHECK-NEXT: Command 0: "printf"
+# CHECK-NEXT: Command 0 Result: 0
+# CHECK-NEXT: Command 0 Output:
+# CHECK-NEXT: line 1: failed test output on stdout
+# CHECK-NEXT: line 2: failed test output on stdout
+
+# CHECK: UNRESOLVED: shtest-format :: no-test-line.txt
+# CHECK: PASS: shtest-format :: pass.txt
+# CHECK: UNSUPPORTED: shtest-format :: requires-missing.txt
+# CHECK: PASS: shtest-format :: requires-present.txt
+# CHECK: UNSUPPORTED: shtest-format :: unsupported_dir/some-test.txt
+# CHECK: XFAIL: shtest-format :: xfail-feature.txt
+# CHECK: XFAIL: shtest-format :: xfail-target.txt
+# CHECK: XFAIL: shtest-format :: xfail.txt
+# CHECK: XPASS: shtest-format :: xpass.txt
+# CHECK-NEXT: *** TEST 'shtest-format :: xpass.txt' FAILED ***
+# CHECK-NEXT: Script
+# CHECK-NEXT: --
+# CHECK-NEXT: true
+# CHECK-NEXT: --
+# CHECK: Testing Time
+
+# CHECK: Unexpected Passing Tests (1)
+# CHECK: shtest-format :: xpass.txt
+
+# CHECK: Failing Tests (3)
+# CHECK: shtest-format :: external_shell/fail.txt
+# CHECK: shtest-format :: external_shell/fail_with_bad_encoding.txt
+# CHECK: shtest-format :: fail.txt
+
+# CHECK: Expected Passes    : 4
+# CHECK: Expected Failures  : 3
+# CHECK: Unsupported Tests  : 2
+# CHECK: Unresolved Tests   : 1
+# CHECK: Unexpected Passes  : 1
+# CHECK: Unexpected Failures: 3