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continuation dont work

immiediate number. Richards benchmark runs.

[wip] let backend know about exception flow. also add one more test to see if callee-saved register is restored
during catching exception, the test failed (and I marked it as ignored).

liveins

results in different code (the same as clang did)

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

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

currently we only use 64bit registers, extend/truncate result if it is
not 64bits. This is awful. Going to use all the registers, for example,
AL, AX, EAX, RAX, but will not use AH (so reg alloc is simpler)