GIMPLE EXPERIMENTS FOR DAY ONE
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Add a pass which traverses over the GIMPLE IR to

• Count the number of copy statements in a program.
• Count the number of variables declared ”const” in the program.
• Count the number of occurances of arithmatic operators in the program.
• Count the number of references to global variables in the program.

You can refer to the GCC internal manual available at 
http://gcc.gnu.org/onlinedocs/gccint.pdf (Page 233-235)