[llvm-dev] How to insert instructions before each function calls?

[SHUCAI YAO via llvm-dev]

I'm trying to insert some instructions before each function calls (before
arguments push):
   lea %EAX, label                      ----- new instructions
   mov [ESP+stacksize], %EAX  ----- new instructions
   push arg1
   push arg2
   ...
   push argn
   call callee_name

I am a newbie to LLVM. I tried to use buildMI() to insert the instructions
in the lowercall() function. But I couldn't put these instructions in the
right positions. Is there a way to locate the position by using
MachineBasicBlock iterator?

Any suggestions are appreciated.

Thanks!
Shucai
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