[squirrelfish] Instruction emission slow cases

[wingoog moon]

Hi!
As I understand there are two passes to translate SFX bytecode to the
native code(functions privateCompileMainPass() and
  privateCompileSlowCases()).
So whats the purpose of privateCompileSlowCases(). Why we need
slow cases for each bytecodeInstruction? Is it needed when arguments of
instruction not integer or something else?

Thanks for attention!
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