Is there a tool to spit LLVM's IR out in a more machine-friendly syntax like
XML?
Nope, but, you could add one. 
It should be a AST consumer.
It seems like the correct, if unhelpful, answer to that is bitcode,
which is far more machine-friendly (by my definition) than XML.
What's your eventual goal?
I'm not the one who asked, but I would love to see something like this, not because it's more machine-friendly, but because it's a representation that most languages can handle.
To wit: I'm manipulating IR in Scheme. If there was a two-way map between XML terms and LLVM IR, my life would be much simpler.
S-expressions would be even better, but I'm not holding my breath.
John Clements
I am toying with the idea of a managed IR that converts LLVM IR into code for
my VM that runs in a safe environment, allowing code compiled from any of
LLVM's front-ends (C, C++, Fortran) to be run in a managed environment and
then interoperated with more easily (and safely) from other managed
languages.