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with RegGroup::get_from_value

(for easy debugging)

stack pointer before calling, unless we pushed arguments by stack)

still restored callee-saved registers, should directly jump to it

argument
we need to know whether a block is an exception block by looking at all
the exceptional clauses.

size, etc). add PRINTHEX instruction to print a number (for debugging use)

need to be fixed)

internally they do nothing (gc doesnt move in zebu atm)

cannot run test_throw in test_rpython along with other pytests
(especially tests from c script). Will look into this later

other tests

currently its not working because we cannot restore callee saved
regsiter from the last frame (or the rust frame to throw exception).
One solution is to save all the callee saved registers in a function
that can throw.

single defining has same behavior

global

1. see vm/vm_options.rs for usage and default values
2. added mu_fastimpl_new_with_opts under vm/api/api_impl/muvm.rs