[LLVMdev] add pass to O2. use as "clang -O2 .."

[Yuanfang Chen]

Hello folks,

I wrote a transforming looppass for my project, opt --help can see it. I
want clang to use my pass too, so that I don't have to compile to IR, opt,
and then llc to binary manually. Now I am trying to add my pass to O2
by mimicking LICM pass.

I add a line "MPM.add(createMyPass());"
in PassManagerBuilder::populateModulePassManager, and got assertion fail
"void llvm::PMTopLevelManager::schedulePass(llvm::Pass*): Assertion `PI &&
"Expected required passes to be initialized"' failed."  I can't figure out
how to solve this?  thanks for any inputs.

yuanfang
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