trace_processor: fix MSAN failure in EqualIndices

We were looking at the wrong size (the size of the main deque instead
of the size of the index deque.

Fix this and add a test for this as well. Also a misc fix for MSAN
to not crash on import of a trace.

Change-Id: I0780d51e18691a6f753932a782f1b545ef0b9f6c
diff --git a/tools/install-build-deps b/tools/install-build-deps
index 93b08ee..a52b7a9 100755
--- a/tools/install-build-deps
+++ b/tools/install-build-deps
@@ -188,8 +188,8 @@
 
   # Example traces for regression tests.
   ('buildtools/test_data.zip',
-   'https://storage.googleapis.com/perfetto/test-data-20190402-104552.zip',
-   '7ce05568bc067f582ba41287c98d812c865952b3',
+   'https://storage.googleapis.com/perfetto/test-data-20190403-122506.zip',
+   '5092cabf96cb3fc9335274a296d34cc2ddefa874',
    'all',
   ),