[examples] Add a dependency on ExecutionEngine to LLJITWithObjectCache example.
ExecutionEngine.cpp contains the anchor() for the ObjectCache base class, so we
need an explicit dependency on it.
Patch by Stephen Neuendorffer. Thanks Stephen!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375461 91177308-0d34-0410-b5e6-96231b3b80d8
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