Question about assertion code in 'BuildMI' function with MachineBasicBlock

[JinGu Kang]

Hi all,

While I using BuildMI with MachineBasicBlock as parameter, I made a 
mistake. The mistake was that the MachineBasicBlock of instruction, 
which is for insertion, is different with given MachineBasicBlock as 
parameter. I have thought if there is assertion code to check whether 
MachineBasicBlocks are same between instruction's MachineBasicBlock and 
given MachineBasicBlock as parameter or not, it might be so useful to 
find wrong code. How do you feel about this? Is it useful or not? In 
order to do this, I have attached a simple patch. If there is something 
wrong, please let me know.

Thanks,
JinGu Kang
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