[llvm-commits] patch for printing machine instrs after a specified pass

[Bin Zeng]

Hi all,

My name is Bin Zeng and an intern working on a project to serialize MachineInstrs 
in the backend. This patch adds a insertPass API to insert a pass before each instance
of another pass and enhances the existing -print-machineinstrs so that the MachineInstrs
after a specific pass can be printed. For instance, to print the MachineInstrs after branch-folder
pass, you can do: $llc -O3 -print-machineinstrs=branch-folder filename.bc -o filename.s 
Also, the command line option is back compatible. You can dump MachineInstrs after all
the passes. 

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Thanks for reading. 
-Bin