Rework Appveyor config

Currently the Appveyor bot is a PIT. It never passes and it often hangs
or gives very poor output. This patch rewrites the configuration.

This patch also attempts to fix a flaky complexity test as a drive-by.

1 files changed, 3 insertions, 0 deletions

diff --git a/test/complexity_test.cc b/test/complexity_test.cc
index 6e903fb..db04183 100644
--- a/test/complexity_test.cc
+++ b/test/complexity_test.cc
@@ -160,6 +160,9 @@ int AddComplexityTest(std::vector<TestCase>* console_out, std::vector<TestCase>*
 
 void BM_Complexity_O1(benchmark::State& state) {
   while (state.KeepRunning()) {
+      for (int i=0; i < 1024; ++i) {
+          benchmark::DoNotOptimize(&i);
+      }
   }
   state.SetComplexityN(state.range(0));
 }