[Ryujit/ARM32] Apply review feedback
[Ryujit/ARM32] Apply review feedback

* Add assertion to freeRegister()
* Remove unnecessary code to update regsToFree and delayedRegsToFree
* Remove misleading assertion in unassignPhysReg()

Signed-off-by: Hyung-Kyu Choi <b24f6a1d8ab6a697998e8a2c60eb031a02db5070@samsung.com>

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