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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

1. compiler knows all the registers
2. but only 64bits register is a color (for reg alloc)
3. backend records the length of GPR for each operand during instruction
selection
4. after reg alloc, when replacing temp with a color, find corresponding
GPR for the length recorded before

we never go back to previous passes, since it is not necessary

convention(stack args), and need to optimize spill1 code

partially serialize compiled function into bootimage

cannot get it work by loading it dynamically. Rust mangles mu runtime
functions in test executable (even if I stated #[no_mangle]), so the
dynamic library cannot call mu runtime functions (symbols not found)

(for blocks created during instruction selection)

some refactoring: 1. allows reg alloc using other allocators (other than graph coloring), 2. allows retreat to a previous compilation pass