[cfe-commits] [patch] Add the returns_twice attribute to know functions

[Rafael Ávila de Espíndola]

This patch makes clang add the returns_twice attribute to functions that 
are known to have it.

The list of functions is taken from llvm's callsFunctionThatReturnsTwice 
plus the __sigsetjmp as reported Khaled.

The hope is that we can simplify callsFunctionThatReturnsTwice to check 
only for the attribute.

Is the patch OK?

Would a patch dropping the list from callsFunctionThatReturnsTwice be OK 
for 3.0 or 3.1?

Thanks,
Rafael
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