Bug 1474254 -- Disable test Jemalloc.JunkPoison for Windows ccov builds.

Summary: GTest is permafailing on Windows because of timeout.

Reviewers: glandium

Reviewed By: glandium

Bug #: 1474254

Differential Revision: https://phabricator.services.mozilla.com/D2043

memory/gtest/TestJemalloc.cpp

@@ -436,6 +436,8 @@ TEST(Jemalloc, InPlace)
   // moz_dispose_arena(arena);
 }
 
+// Bug 1474254: disable this test for windows ccov builds because it leads to timeout.
+#if !defined(XP_WIN) || !defined(MOZ_CODE_COVERAGE)
 TEST(Jemalloc, JunkPoison)
 {
   jemalloc_stats_t stats;
@@ -622,3 +624,4 @@ TEST(Jemalloc, JunkPoison)
   // Until Bug 1364359 is fixed it is unsafe to call moz_dispose_arena.
   // moz_dispose_arena(buf_arena);
 }
+#endif