[patch] Don't rename in Module::getOrInsertFunction.

[Rafael Espíndola]

Duncan recently reminded me that Module::getOrInsertFunction can
rename globals to make the new one fit. That is fairly surprising,
given the name of the function and what a central part of llvm it is.

Going over git log it looks like this was done to help with the
transition out of type planes. I have already done a simple "ninja
check-all" and both clang's and llvm's tests are clear. I will also
try a bootstrap and running the llvm testsuite.

Is the attached patch OK if all of the above works?

Cheers,
Rafael
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