[Lit] Sort previously failed tests early

[dmgreen]

Summary

D98179 added a mechanism to sort tests by test time to run slow tests early, increasing potential parallelism. It also added a feature where negative tests would be marked as negative, allowing subsequent test runs to run them earlier. Unfortunately it never actually stored the negative time though, even if all the other code seemed to be inplace to sort them early. Luckily the fix seems simple.

[thopre]

LGTM, thanks!

llvm/utils/lit/lit/TestTimes.py

for t in tests:
             continue
         if not t.suite.exec_root in times_by_suite:
             times_by_suite[t.suite.exec_root] = read_test_times(t.suite)
         time = -t.result.elapsed if t.isFailure() else t.result.elapsed
         # The "path" here is only used as a key into a dictionary. It is never
         # used as an actual path to a filesystem API, therefore we use '/' as
         # the canonical separator so that Unix and Windows machines can share
         # timing data.
-        times_by_suite[t.suite.exec_root]['/'.join(t.path_in_suite)] = t.result.elapsed
+        times_by_suite[t.suite.exec_root]['/'.join(t.path_in_suite)] = time
 
     for s, value in times_by_suite.items():
         try:
             path = os.path.join(s, '.lit_test_times.txt')
             with open(path, 'w') as time_file:
                 for name, time in value.items():
                     time_file.write(("%e" % time) + ' ' + name + '\n')
         except:
             lit_config.warning('Could not save test time: ' + path)
             continue

llvm/utils/lit/tests/Inputs/reorder/.lit_test_times.txt

 42.0 not-executed.txt
 3.0 subdir/ccc.txt
 2.0 bbb.txt
+-0.2 fff.txt
 0.1 aaa.txt

llvm/utils/lit/tests/Inputs/reorder/fff.txt

+# RUN: false

llvm/utils/lit/tests/reorder.py

 ## Check that we can reorder test runs.
 
 # RUN: cp %{inputs}/reorder/.lit_test_times.txt %{inputs}/reorder/.lit_test_times.txt.orig
-# RUN: %{lit-no-order-opt} %{inputs}/reorder > %t.out
+# RUN: not %{lit-no-order-opt} %{inputs}/reorder > %t.out
 # RUN: cp %{inputs}/reorder/.lit_test_times.txt %{inputs}/reorder/.lit_test_times.txt.new
 # RUN: cp %{inputs}/reorder/.lit_test_times.txt.orig %{inputs}/reorder/.lit_test_times.txt
 # RUN: not diff %{inputs}/reorder/.lit_test_times.txt.new %{inputs}/reorder/.lit_test_times.txt.orig
 # RUN: FileCheck --check-prefix=TIMES --implicit-check-not= < %{inputs}/reorder/.lit_test_times.txt.new %s
 # RUN: FileCheck < %t.out %s
 # END.
 
 # TIMES: not-executed.txt
 # TIMES-NEXT: subdir/ccc.txt
 # TIMES-NEXT: bbb.txt
+# TIMES-NEXT: -{{.*}} fff.txt
 # TIMES-NEXT: aaa.txt
 # TIMES-NEXT: new-test.txt
 
-# CHECK:     -- Testing: 4 tests, 1 workers --
+# CHECK:     -- Testing: 5 tests, 1 workers --
+# CHECK-NEXT: FAIL: reorder :: fff.txt
 # CHECK-NEXT: PASS: reorder :: subdir/ccc.txt
 # CHECK-NEXT: PASS: reorder :: bbb.txt
 # CHECK-NEXT: PASS: reorder :: aaa.txt
 # CHECK-NEXT: PASS: reorder :: new-test.txt
 # CHECK:     Passed: 4