nondet app_suite test failures

I'm not yet sure whether these are failures coming from my update to the
latest DR or something on this machine, but they are non-deterministic and
I have yet to reproduce the failures outside of the full suite. The full
suite sometimes passes and sometimes has these failures.

32-bit app_suite sometimes fails with this:

```
[ RUN ] MallocTests.HeapCompact
D:\derek\drmemory\git\src\tests\app_suite\malloc_tests_win.cpp(32): error: Expected: (largest) > (64), actual: 8 vs 64
[ FAILED ] MallocTests.HeapCompact (167 ms)
```

64-bit app_suite:

```
[ RUN ] ShellTest.CreateAndResolveShortcut
D:\derek\drmemory\git\src\tests\app_suite\shell32_tests_win.cpp(148): error: Value of: SUCCEEDED(hr)
Actual: false
Expected: true
D:\derek\drmemory\git\src\tests\app_suite\shell32_tests_win.cpp(157): error: Value of: link_target
Actual: L""
Expected: file_path_
Which is: L"C:\\Users\\derek\\AppData\\Local\\Temp\\app_suite_txt_file.txt"
D:\derek\drmemory\git\src\tests\app_suite\shell32_tests_win.cpp(162): error: Value of: description
Actual: L""
Expected: kLinkDescription
Which is: L"ResolveShortcutTest"
[ FAILED ] ShellTest.CreateAndResolveShortcut (475 ms)
```