[Suggestion] Passing upvalues to load()

["Soni L." <fakedme@...>]

I think load() should, in addition to _ENV, also take a list of 
upvalues, which are only used when loading bytecode.

When loading bytecode _ENV is assumed to be the first upvalue, upvalue 
0, so we just need to make it varargs for the other upvalues.

This reduces the need for debug.upvaluejoin() (or w/e, setupvalue?) when 
loading bytecode.

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