cleans up initialization of runtime reflection

At first I just tried to remove syntheticCoreClasses from missingHook
and put them into the initializer of freshly created mirrors in order to
reduce the non-determinism in mutations of the global symbol table.

And then it didn't work, crashing on me claiming that AnyRef is missing.
Apparently we still need AnyRefClass in missingHook, just because it's
impossible to initialize (i.e. unpickle) ScalaPackageClass without it.

And then it still didn't work, whining about multiple overloaded defs
of some synthetic symbols. That was really tricky, but I figured it out
as well by initializing ScalaPackageClass first before forcing any
synthetic symbols (see the details in comments).

And then it worked, but stopped working half a year later when
Jason and I came to revisit this old pull request. The final twist
was pre-initializing ObjectClass, because it's a dependency of AnyRefClass,
which is a critical dependency of ScalaPackageClass (full information
can be found in comments).

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