[LLVMdev] Shrink Wrapping - RFC and initial implementation

[John Mosby]

Here is an updated patch for shrink wrapping with:
- spills/restores done with stack slot stores/loads
- stack adjustment removed
- refactoring (but still in need of more)
- spill/restore insertion code unified with spill/restore placement code

Documentation available
here<http://wiki.github.com/jdmdj/llvm-work/shrink-wrapping-work>
illustrates shrink
wrapping with loops and discusses a situation in which the pass would be
more effective by splitting edges in the Machine CFG (similar to breaking
crit. edges in the CFG).

Test cases are attached.

Thanks,
John
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