Allow optimizer to depend on preloaded symbols (#15021)

* Allow optimizer to depend on preloaded symbols

It is safe for the optimizer to rely on preloaded symbols. This can occur wh

Allow optimizer to depend on preloaded symbols (#15021)

* Allow optimizer to depend on preloaded symbols

It is safe for the optimizer to rely on preloaded symbols. This can occur when
compiling non-preloaded files, referencing preloaded ones.

* Disable inline pass for observer test

* Move duplicated code into functions

* Add comment to specific optimization value

* Optimizer should only rely on preloaded symbols in the symbol table

* Fix skipif for windows

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