GC-like pointer to static and relocations handling

[grassator]

Right now when access to a static value at runtime is detected, this value is eagerly copied into the data section of the executable with runtime relocations added along the way. This is bad as we might not capture the latest state of the value if it is mutable at compile time. Additionally it is quite awkward to handle.

Potentially better approach would be to gather up "root" values that need to be copied to runtime and use the descriptors to recursively copy them to the output when generating an executable.