[ORC] Fix examples after 6dbf9d1ac5e (forward declaration of MemoryAc… (#191834)
…cess).
6dbf9d1ac5e forward declared the MemoryAccess class in
ExecutorProcessControl.h, breaking some examples that were depending on
the transitive include. (See e.g.
https://lab.llvm.org/buildbot/#/builders/80/builds/21875).
This commit adds the missing #includes to the broken examples.