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currently mov constant as imm to a GPR, then mov from GPR
to xmm. A better approach should be put the immediate in memroy,
and load it

when we add interefence between %a and %edi, we also add %a with %rdi
because we cannot assign rdi to a

wip: refactor performance comparison code. Need floating point support to embed time measurement code in RPython side

for movl %edi %edi (where two operands are actually %edi %rdi), we will
do a check, and ensure it get removed

changed a condition on coealescing. Fixed a bug in spilling rewrite.
Currently test_extern_Func is broken

was using nalgebra::DMatrix to implement a graph

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